Contents 1 History 1.1 Pre-human 1.2 Native American period 1.3 Spanish colonial 1.4 Mexican land grants 1.5 Bear Flag Republic and statehood 1.6 County creation 1.7 1941–1945 1.8 Early postwar period 1.9 Later postwar period (1955–1970) 1.10 Modern period 2 Geography 2.1 National protected areas 2.2 Mount Diablo 3 Demographics 3.1 2011 3.1.1 Places by population, race, and income 3.2 2010 3.3 2000 4 Politics 4.1 Voter registration statistics 4.1.1 Cities by population and voter registration 5 Crime 5.1 Cities by population and crime rates 6 Economy 6.1 Agriculture 6.2 Irrigation canals 6.3 Commuter railroads 6.4 Heavy industry 6.5 Housing 6.5.1 West County 6.5.2 Central county 6.5.3 East County 6.6 Urban decay at the fringes 6.7 County budget problems 6.8 Technical innovators 6.9 Corporate headquarters 6.10 Redevelopment 7 Education 8 Media 9 Transportation 9.1 Major highways 9.2 Mass transit 9.3 Airports 9.4 Railroads 10 Attractions 11 Parks and recreation 11.1 Trails 12 Utilities 13 California casino proposals 13.1 Proposals 14 Communities 14.1 Cities 14.2 Census-designated places 14.3 Unincorporated communities 14.4 Former communities 14.5 Ghost towns 14.6 Other places 14.7 Population ranking 15 See also 16 Notes 17 References 18 External links


History[edit] Pre-human[edit] In prehistoric times, particularly the Miocene epoch, portions of the landforms now in the area (then marshy and grassy savanna) were populated by a wide range of now extinct mammals, known in modern times by the fossil remains excavated in the southern part of the county. In the northern part of the county, significant coal and sand deposits were formed in even earlier geologic eras. Other areas of the county have ridges exposing ancient but intact (not fossilized) seashells, embedded in sandstone layers alternating with limestone. Layers of volcanic ash ejected from geologically recent but now extinct volcanoes, compacted and now tilted by compressive forces, may be seen at the site of some road excavations. This county is an agglomeration of several distinct geologic terranes, as is most of the greater San Francisco Bay Area, which is one of the most geologically complex regions in the world. The great local mountain Mount Diablo has been formed and continues to be elevated by compressive forces resulting from the action of plate tectonics and at its upper reaches presents ancient seabed rocks scraped from distant oceanic sedimentation locations and accumulated and lifted by these great forces. Younger deposits at middle altitudes include pillow lavas, the product of undersea volcanic eruptions. Native American period[edit] There is an extensive but little recorded human history pre-European settlement in this area, with the present county containing portions of regions populated by a number of Native American tribes. The earliest definitively established occupation by modern man (Homo sapiens) appears to have occurred six to ten thousand years ago. However, there may have been human presence far earlier, at least as far as non–settling populations are concerned. The known settled populations were hunter-gatherer societies that had no knowledge of metals and that produced utilitarian crafts for everyday use (especially woven reed baskets) of the highest quality and with graphic embellishments of great aesthetic appeal. Extensive trading from tribe to tribe transferred exotic materials such as obsidian (useful for the making of arrowheads) throughout the region from far distant Californian tribes. Unlike the nomadic Native American of the Great Plains it appears that these tribes did not incorporate warfare into their culture but were instead generally cooperative. Within these cultures the concept of individual or collective land ownership was nonexistent. Early European settlers in the region, however, did not record much about the culture of the natives. Most of what is known culturally comes from preserved contemporaneous and excavated artifacts and from inter-generational knowledge passed down through northerly outlying tribes of the larger region. Spanish colonial[edit] Early interaction of these Native Americans with Europeans came with the Spanish colonization via the establishment of missions in this area, with the missions in San Jose, Sonoma, and San Francisco and particularly the establishment of a Presidio (a military establishment) in 1776. Although there were no missions established within this county, Spanish influence here was direct and extensive, through the establishment of land grants from the King of Spain to favored settlers. Mexican land grants[edit] In 1821 Mexico gained independence from Spain. While little changed in ranchero life, the Mexican War of Independence resulted in the secularization of the missions with the re-distribution of their lands, and a new system of land grants under the Mexican Federal Law of 1824. Mission lands extended throughout the Bay Area, including portions of Contra Costa County. Between 1836 and 1846, during the era when California was a province of independent Mexico, the following 15 land grants were made in Contra Costa County.[8] Acalanes Arroyo de Las Nueces y Bolbones Boca de la Cañada del Pinole Cañada del Hambre y Las Bolsas Cañada de los Vaqueros Laguna de los Palos Colorados Las Juntas Los Medanos Los Meganos Monte del Diablo El Pinole San Pablo San Ramon (Amador) San Ramon (Pacheco-Castro) El Sobrante The smallest unit was one square league, or about seven square miles, or 4,400 acres (17.8 km2), maximum to one individual was eleven leagues, or 48,400 acres (195.9 km2), including no more than 4,428 acres (17.9 km2) of irrigable land. Rough surveying was based on a map, or diseño, measured by streams, shorelines, and/or horseman who marked it with rope and stakes. Lands outside rancho grants were designated el sobrante, as in surplus or excess, and considered common lands. The law required the construction of a house within a year. Fences were not required and were forbidden where they might interfere with roads or trails. Locally a large family required roughly 2000 head of cattle and two square leagues of land (fourteen square miles) to live comfortably. Foreign entrepreneurs came to the area to provide goods that Mexico couldn’t, and trading ships were taxed.[note 1] Rancho Canada de los Vaqueros was granted to Francisco Alviso, Antonio Higuera, and Manuel Miranda (26,660 acres (107.9 km2) confirmed in 1889 to heirs of Robert Livermore). Two ranchos, both called Rancho San Ramon, were granted by the Mexican government in the San Ramon Valley. In 1833, Bartolome Pacheco (southern San Ramon Valley) and Mariano Castro (northern San Ramon Valley) shared the two square league Rancho San Ramon. Jose Maria Amador was granted a four square league Rancho San Ramon in 1834. In 1834 Rancho Monte del Diablo (present day Concord, California) was confirmed with 17,921 acres (72.5 km2) to Salvio Pacheco (born July 15, 1793, died 1876). The Pacheco family settled at the Rancho in 1846 (between the Pacheco shipping port townsite and Clayton area, and including much of Lime Ridge). The boundary lines were designated with stone markers. Clayton was later located on sobrante lands just east of Rancho Monte del Diablo (Mount Diablo). In 1834, Rancho Arroyo de Las Nueces y Bolbones, aka Rancho San Miguel (present day Walnut Creek), was granted to Juana Sanchez de Pacheco, in recognition of the service of Corporal Miguel Pacheco 37 years earlier (confirmed 1853, patented to heirs 1866); the grant was for two leagues, but drawn free hand on the diseño/map, and reading "two leagues, more or less" as indicated in the diseño, but actually including and confirmed for nearly four leagues or nearly 18,000 acres (72.8 km2), but only 10,000 acres (40.5 km2) were ever shown as having once belonged to Juana Sanchez. 'Meganos' means 'sand dunes.' A "paraje que llaman los Méganos" 'place called the sand dunes' (with a variant spelling) is mentioned in Durán's diary on May 24, 1817. Two Los Meganos Ranchos were granted, later differentiated as Rancho Los Meganos (1835, three leagues or at least 13,285 acres (53.8 km2)) in what is now the Brentwood area, to Jose Noriega then acquired by John Marsh; and Rancho Los Medanos (to Jose Antonio Mesa and Jose Miguel Garcia, Pittsburg area, dated November 26, 1839). Bear Flag Republic and statehood[edit] Main article: Bear Flag Revolt The exclusive land ownership in California by the approximate 9,000[9] Hispanics in California would soon end. John Marsh, owner of Rancho Los Meganos in Contra Costa County, had a lot to do with this. He sent letters to influential people in the eastern United States extolling the climate, soil and potential for agriculture in California, with the deliberate purpose of encouraging Americans to immigrate to California and lead to its becoming part of the United States. He succeeded. His letters were published in newspapers throughout the East, and started the first wagon trains rolling toward California. He also invited them to stay on his ranch until they could get settled, so the Rancho Los Meganos became the terminus of the California trail.[10] This led to the Bear Flag Revolt in 1846 when about 30 settlers originally from the United States declared a republic in June 1846 and were enlisted and fighting under the U.S. flag by July 1846. Following the Mexican–American War of 1846–48, California was controlled by U.S. settlers organized under the California Battalion and the U.S. Navy's Pacific Squadron. After some minor skirmishes California was under U.S. control by January 1847 and formally annexed and paid for by the U.S. in 1848. By 1850 the over-100,000 population and rapidly growing California population gain due to the California gold rush and the large amount of gold being exported east gave California enough clout to choose its own boundaries, write its own constitution and be admitted to the Union as a free state in 1850 without going through territorial status as required for most other states. In 1850 California had a non-Indian population of over 100,000.[11] The number of Indians living in California in 1850 has been estimated to be from 60,000 to 100,000. By 1850 the Mission Indian populations had largely succumbed to disease and abuse and only numbered a few thousand. California's 1852 state Census gives 31,266 Indian residents; but this is an under-count since there was little incentive and much difficulty in getting it more correct.[12] County creation[edit] Postcard showing the Contra Costa County Courthouse in 1906. Contra Costa County was one of the original 27 counties of California, created in 1850 at the time of statehood. The county was originally to be called Mt. Diablo County, but the name was changed prior to incorporation as a county. The county's Spanish language name means opposite coast, because of its location opposite San Francisco, in an easterly direction, on San Francisco Bay. Southern portions of the county's territory, including all of the bayside portions opposite San Francisco and northern portions of Santa Clara County, were given up to form Alameda County effective March 25, 1853. The land titles in Contra Costa County may be traced to multiple subdivisions of a few original land grants. The grantee's family names live on in a few city and town names such as Martinez, Pacheco and Moraga and in the names of streets, residential subdivisions, and business parks. A few mansions from the more prosperous farms have been preserved as museums and cultural centers and one of the more rustic examples has been preserved as a working demonstration ranch, Borges Ranch. 1941–1945[edit] During World War II, Richmond hosted one of the two Bay Area sites of Kaiser Shipyards and wartime pilots were trained at what is now Concord/Buchanan Field Airport. Additionally, a large Naval Weapons Depot and munitions ship loading facilities at Port Chicago remain active to this day, but with the inland storage facilities recently declared surplus, extensive redevelopment is being planned for this last large central-county tract. The loading docks were the site of a devastating explosion in 1944. Port Chicago was bought out and demolished by the Federal Government to form a safety zone near the Naval Weapons Station loading docks. At one time the Atlas Powder Company (subsequently closed) produced gunpowder and dynamite. The site of the former Atlas Powder Company is located at Point Pinole Regional Shoreline,[13] part of the East Bay Regional Parks District.[14] Early postwar period[edit] With the postwar baby boom and the desire for suburban living, large tract housing developers would purchase large central county farmsteads and develop them with roads, utilities and housing. Once mostly rural walnut orchards and cattle ranches, the area was first developed as low-cost, large-lot suburbs, with a typical low-cost home being placed on a "quarter-acre" (1,000 m²) lot — actually a little less at 10,000 square feet (930 m²). Some of the expansion of these suburban areas was clearly attributable to white flight from decaying areas of Alameda County and the consolidated city-county of San Francisco, but much was due to the postwar baby boom of the era creating demand for three- and four-bedroom houses with large yards that were unaffordable or unavailable in the established bayside cities. Later postwar period (1955–1970)[edit] A number of large companies followed their employees to the suburbs, filling large business parks. The establishment of a large, prosperous population in turn fostered the development of large shopping centers and created demand for an extensive supporting infrastructure including roads, schools, libraries, police, firefighting, water, sewage, and flood control. Modern period[edit] The establishment of BART, the modernization of Highway 24, and the addition of a fourth Caldecott Tunnel bore all served to reinforce the demographic and economic trends in the Diablo area, with cities such as Walnut Creek becoming edge cities. The central county cities have in turn spawned their own suburbs within the county, extending east along the county's estuarine north shore; with the older development areas of Bay Point and Pittsburg being augmented by extensive development in Antioch, Oakley, and Brentwood. The effects of the housing value crash (2008–2011) have varied widely throughout the county. Values of houses in prosperous areas with good schools have declined only modestly in value, while houses recently built in outlying suburbs in the eastern part of the county have experienced severe reductions in value, accelerated by high unemployment and consequent mortgage foreclosures, owner strategic walk-aways, and the too-rapid conversion of neighborhoods from owner-occupancy to rentals.


Geography[edit] According to the U.S. Census Bureau, the county has a total area of 804 square miles (2,080 km2), of which 716 square miles (1,850 km2) is land and 88 square miles (230 km2) (11%) is water.[15] Contra Costa County's physical geography is dominated by the bayside alluvial plain, the Oakland Hills–Berkeley Hills, several inland valleys, and Mount Diablo, an isolated 3,849-foot (1,173 m) upthrust peak at the north end of the Diablo Range of hills. The summit of Mount Diablo is the origin of the Mount Diablo Meridian and Base Line, on which the surveys of much of California and western Nevada are based. The Hayward Fault Zone runs through the western portion of the county, from Kensington to Richmond. The Calaveras Fault runs in the south-central portion of the county, from Alamo to San Ramon. The Concord Fault runs through part of Concord and Pacheco, and the Clayton-Marsh Creek-Greenville Fault runs from Clayton at its north end to near Livermore. These slip-strike faults and the Diablo thrust fault near Danville are all considered capable of significantly destructive earthquakes and many lesser related faults are present in the area that cross critical infrastructure such as water, natural gas, and petroleum product pipelines, roads, highways, railroads, and BART rail transit. National protected areas[edit] Antioch Dunes National Wildlife Refuge Eugene O'Neill National Historic Site John Muir National Historic Site Rosie the Riveter/World War II Home Front National Historical Park Mount Diablo[edit] Mount Diablo from the Shell Ridge Open Space Main article: Mount Diablo The most notable natural landmark in the county is 3,849 feet (1,173 m) Mount Diablo, at the northerly end of the Diablo Range. Mount Diablo and its neighboring North Peak are the centerpiece of Mt. Diablo State Park (MDSP), created legislatively in 1921 and rededicated in 1931 after land acquisitions had been completed. At the time this comprised a very small portion of the mountain. In the 1960s the open space of the mountain was threatened with suburban development expanding from the surrounding valleys. In 1971, when MDSP included 6,788 acres (27.5 km2), the non-profit organization Save Mount Diablo was formed and open space preservation accelerated. MDSP was the first of twenty-nine Diablo area parks and preserves created around the peaks, today totaling more than 89,000 acres (360 km2). These Diablo public lands stretch southeast and include the Concord Naval Weapons Station, Shell Ridge Open Space and Lime Ridge Open Spaces near Walnut Creek, to the State Park, and east to the Los Vaqueros Reservoir watershed and four surrounding East Bay Regional Park District preserves, including Morgan Territory Regional Preserve, Brushy Peak Regional Preserve, Vasco Caves Regional Preserve, and Round Valley Regional Preserves. The new Cowell Ranch State Park, and Black Diamond Mines Regional Preserve, are among the open spaces stretching back to the north. In this way the open spaces controlled by cities, the East Bay Regional Park District, Mount Diablo State Park, and various regional preserves now adjoin and protect most of the elevated regions of the mountain. The name Mount Diablo is said to originate from an incident involving Spanish soldiers who christened a thicket ‘Monte del Diablo’ when natives they were pursuing apparently disappeared in the thicket. Anglo settlers later misunderstood the use of the word ‘monte’ (which can mean ‘mountain’, or ‘thicket’), and fastened the name on the most obvious local landmark. According to the Contra Costa Times, in 2011, there were rumors that Contra Costa County was going to rename the Mountain, "Mt. Ronald Reagan" or "Mt. Reagan", after the former California Governor. There were also multiple petitions that were created by citizens to change the name of the mountain, once in 2005 and another in 2011.


Demographics[edit] 2011[edit] Population, race, and income Total population[16] 1,037,817   White[16] 656,311 63.2%   Black or African American[16] 94,782 9.1%   American Indian or Alaska Native[16] 4,375 0.4%   Asian[16] 147,948 14.3%   Native Hawaiian or other Pacific Islander[16] 4,727 0.5%   Some other race[16] 79,498 7.7%   Two or more races[16] 50,176 4.8%  Hispanic or Latino (of any race)[17] 248,089 23.9% Per capita income[18] $38,141 Median household income[19] $79,135 Median family income[20] $93,437 Places by population, race, and income[edit] Places by population and race Place Type[21] Population[16] White[16] Other[16] [note 2] Asian[16] Black or African American[16] Native American[16] [note 3] Hispanic or Latino (of any race)[17] Acalanes Ridge CDP 1,431 71.6% 14.0% 11.8% 0.0% 2.6% 4.8% Alamo CDP 15,531 88.6% 3.4% 7.1% 0.6% 0.2% 3.6% Alhambra Valley CDP 910 98.6% 0.0% 1.4% 0.0% 0.0% 0.0% Antioch City 101,118 51.7% 19.2% 9.8% 17.5% 1.8% 32.1% Bay Point CDP 21,987 51.0% 28.5% 7.6% 12.1% 0.8% 54.1% Bayview CDP 2,168 55.5% 9.7% 18.2% 15.3% 1.3% 29.6% Bethel Island CDP 1,882 92.2% 5.6% 2.2% 0.0% 0.0% 11.8% Blackhawk CDP 9,186 72.2% 4.9% 19.0% 4.0% 0.0% 5.8% Brentwood City 48,582 73.7% 13.1% 6.7% 5.5% 1.0% 28.6% Byron CDP 1,287 84.8% 10.4% 0.4% 4.4% 0.0% 13.8% Camino Tassajara CDP 1,813 51.9% 2.5% 45.6% 0.0% 0.0% 8.3% Castle Hill CDP 1,369 89.5% 6.6% 3.9% 0.0% 0.0% 8.2% Clayton City 10,856 85.3% 4.6% 7.6% 2.2% 0.3% 8.2% Clyde CDP 529 78.8% 9.8% 11.3% 0.0% 0.0% 37.4% Concord City 121,989 69.2% 15.0% 11.8% 3.1% 1.0% 27.9% Contra Costa Centre CDP 5,773 69.2% 8.2% 20.6% 2.0% 0.0% 10.3% Crockett CDP 2,921 85.6% 7.6% 4.9% 1.0% 0.9% 11.7% Danville Town 41,994 81.7% 5.7% 11.6% 0.8% 0.1% 5.9% Diablo CDP 1,083 70.0% 16.6% 11.0% 0.0% 2.4% 0.0% Discovery Bay CDP 12,506 86.2% 5.1% 2.0% 5.7% 1.0% 10.1% East Richmond Heights CDP 3,157 66.0% 4.6% 9.8% 18.9% 0.7% 7.9% El Cerrito City 23,482 58.3% 9.3% 24.9% 7.2% 0.3% 12.0% El Sobrante CDP 13,823 62.6% 11.0% 14.6% 11.4% 0.5% 23.4% Hercules City 23,556 28.3% 9.0% 43.8% 16.7% 2.1% 12.2% Kensington CDP 5,117 78.6% 7.7% 12.3% 1.0% 0.4% 4.3% Knightsen CDP 1,484 78.3% 19.6% 0.6% 1.1% 0.3% 30.6% Lafayette City 23,863 86.7% 4.6% 8.1% 0.6% 0.0% 6.3% Martinez City 35,808 79.7% 7.4% 7.6% 4.6% 0.6% 13.6% Montalvin Manor CDP 2,614 68.4% 11.0% 11.1% 3.6% 5.9% 49.5% Moraga Town 16,033 78.8% 3.5% 14.8% 2.1% 0.7% 7.3% Mountain View CDP 2,032 89.7% 4.7% 1.5% 2.3% 1.8% 18.7% Norris Canyon CDP 941 65.9% 1.2% 32.9% 0.0% 0.0% 0.0% North Gate CDP 387 92.5% 0.0% 7.5% 0.0% 0.0% 0.0% North Richmond CDP 3,214 31.5% 17.8% 16.5% 34.2% 0.0% 43.9% Oakley City 34,410 65.3% 20.0% 5.8% 7.8% 1.2% 39.7% Orinda City 17,599 82.0% 6.0% 10.1% 1.7% 0.3% 3.8% Pacheco CDP 4,022 76.2% 7.4% 11.9% 2.2% 2.3% 13.9% Pinole City 18,470 49.8% 16.8% 23.0% 10.1% 0.3% 21.7% Pittsburg City 62,528 40.6% 24.6% 15.1% 17.8% 1.9% 41.7% Pleasant Hill City 33,045 75.4% 9.0% 13.5% 2.0% 0.2% 14.0% Port Costa CDP 274 90.5% 4.7% 4.7% 0.0% 0.0% 0.0% Reliez Valley CDP 3,141 85.6% 4.2% 9.7% 0.5% 0.0% 11.2% Richmond City 103,161 43.8% 14.4% 14.7% 26.5% 0.6% 37.9% Rodeo CDP 8,786 50.1% 12.3% 22.8% 14.2% 0.5% 21.4% Rollingwood CDP 2,790 53.3% 17.0% 25.2% 3.0% 1.5% 57.8% San Miguel CDP 3,382 92.9% 1.7% 4.3% 0.9% 0.1% 2.4% San Pablo City 29,224 53.7% 14.4% 15.9% 14.7% 1.3% 55.8% San Ramon City 69,241 53.4% 7.8% 35.9% 2.3% 0.5% 9.9% Saranap CDP 4,486 85.2% 3.8% 5.8% 5.1% 0.0% 6.4% Shell Ridge CDP 1,123 80.1% 10.2% 9.7% 0.0% 0.0% 19.0% Tara Hills CDP 4,565 59.6% 13.2% 10.5% 14.9% 1.8% 37.3% Vine Hill CDP 3,620 69.7% 11.9% 8.6% 7.3% 2.4% 31.7% Walnut Creek City 64,168 80.7% 4.7% 12.0% 2.3% 0.3% 10.2% Places by population and income Place Type[21] Population[22] Per capita income[18] Median household income[19] Median family income[20] Acalanes Ridge CDP 1,431 $61,205 $138,672 $146,708 Alamo CDP 15,531 $73,964 $149,601 $161,953 Alhambra Valley CDP 910 $67,774 $124,547 $170,583 Antioch City 101,118 $25,264 $66,479 $73,491 Bay Point CDP 21,987 $18,844 $45,389 $48,020 Bayview CDP 2,168 $28,092 $78,385 $77,260 Bethel Island CDP 1,882 $27,443 $30,409 $57,292 Blackhawk CDP 9,186 $83,440 $167,778 $181,955 Brentwood City 48,582 $32,030 $87,642 $96,433 Byron CDP 1,287 $29,723 $71,483 $70,800 Camino Tassajara CDP 1,813 $54,858 $164,773 $197,159 Castle Hill CDP 1,369 $60,700 $119,688 $137,350 Clayton City 10,856 $51,854 $131,991 $142,671 Clyde CDP 529 $36,408 $99,375 $115,795 Concord City 121,989 $31,338 $65,769 $74,205 Contra Costa Centre CDP 5,773 $48,300 $78,176 $90,495 Crockett CDP 2,921 $44,115 $76,023 $89,844 Danville Town 41,994 $61,002 $133,360 $152,368 Diablo CDP 1,083 $161,436 $154,191 $250,001 Discovery Bay CDP 12,506 $46,867 $102,527 $104,522 East Richmond Heights CDP 3,157 $39,283 $92,750 $99,024 El Cerrito City 23,482 $43,529 $83,933 $98,727 El Sobrante CDP 13,823 $29,706 $58,706 $72,177 Hercules City 23,556 $38,687 $94,493 $99,548 Kensington CDP 5,117 $63,253 $124,010 $148,063 Knightsen CDP 1,484 $29,772 $63,359 $77,596 Lafayette City 23,863 $66,492 $134,871 $159,834 Martinez City 35,808 $38,311 $79,705 $94,479 Montalvin Manor CDP 2,614 $23,930 $46,924 $63,287 Moraga Town 16,033 $54,830 $121,875 $151,467 Mountain View CDP 2,032 $25,798 $46,660 $50,423 Norris Canyon CDP 941 $72,940 $250,001 $250,001 North Gate CDP 387 $57,244 $84,781 $97,500 North Richmond CDP 3,214 $19,697 $40,714 $44,681 Oakley City 34,410 $27,742 $78,102 $82,037 Orinda City 17,599 $76,830 $157,500 $183,279 Pacheco CDP 4,022 $28,155 $58,036 $64,814 Pinole City 18,470 $32,649 $80,042 $92,035 Pittsburg City 62,528 $23,344 $57,965 $64,788 Pleasant Hill City 33,045 $42,497 $78,765 $108,403 Port Costa CDP 274 $36,439 $91,429 $91,714 Reliez Valley CDP 3,141 $80,471 $120,144 $154,813 Richmond City 103,161 $25,358 $54,554 $62,477 Rodeo CDP 8,786 $27,048 $65,906 $72,675 Rollingwood CDP 2,790 $15,724 $49,522 $58,125 San Miguel CDP 3,382 $71,225 $129,375 $142,422 San Pablo City 29,224 $17,044 $45,305 $49,955 San Ramon City 69,241 $50,962 $124,014 $139,709 Saranap CDP 4,486 $54,996 $77,708 $103,977 Shell Ridge CDP 1,123 $69,676 $182,500 $205,962 Tara Hills CDP 4,565 $26,773 $58,542 $64,607 Vine Hill CDP 3,620 $24,205 $53,561 $55,592 Walnut Creek City 64,168 $52,727 $84,722 $114,726 2010[edit] Historical population Census Pop. %± 1860 5,328 — 1870 8,461 58.8% 1880 12,525 48.0% 1890 13,515 7.9% 1900 18,046 33.5% 1910 31,674 75.5% 1920 53,889 70.1% 1930 78,608 45.9% 1940 100,450 27.8% 1950 298,984 197.6% 1960 409,030 36.8% 1970 558,389 36.5% 1980 656,380 17.5% 1990 803,732 22.4% 2000 948,816 18.1% 2010 1,049,025 10.6% Est. 2016 1,135,127 [4] 8.2% U.S. Decennial Census[23] 1790–1960[24] 1900–1990[25] 1990–2000[26] 2010–2015[3] The 2010 United States Census reported that Contra Costa County had a population of 1,049,025. The racial makeup of Contra Costa County was 614,512 (58.6%) White; 97,161 (9.3%) African American; 6,122 (0.6%) Native American; 151,469 (14.4%) Asian (4.6% Filipino, 3.8% Chinese, 2.1% Indian); 4,845 (0.5%) Pacific Islander; 112,691 (10.7%) from other races; and 62,225 (5.9%) from two or more races. Hispanic or Latino of any race were 255,560 persons (24.4%); 17.1% of Contra Costa County's population was of Mexican ancestry, while 1.9% was of Salvadoran heritage.[27] Demographic profile[28] 2010 Total Population 1,049,025 - 100.0% One Race 986,800 - 94.1% Not Hispanic or Latino 793,465 - 75.6% White alone 500,923 - 47.8% Black or African American alone 93,604 - 8.9% American Indian and Alaska Native alone 2,984 - 0.3% Asian alone 148,881 - 14.2% Native Hawaiian and Other Pacific Islander alone 4,382 - 0.4% Some other race alone 3,122 - 0.3% Two or more races alone 39,569 - 3.8% Hispanic or Latino (of any race) 255,560 - 24.4% Population reported at 2010 United States Census The County Total Population White African American Native American Asian Pacific Islander other races two or more races Hispanic or Latino (of any race) Contra Costa County 1,049,025 614,512 97,161 6,122 151,469 4,845 112,691 62,225 255,560 Incorporated cities and towns Total Population White African American Native American Asian Pacific Islander other races two or more races Hispanic or Latino (of any race) Antioch 102,372 50,083 17,667 887 10,709 817 14,310 7,899 32,436 Brentwood 51,481 34,969 3,389 333 4,051 202 4,964 3,573 13,779 Clayton 10,897 9,273 146 34 717 16 234 477 982 Concord 122,067 78,767 4,371 852 13,538 816 15,969 7,754 37,311 Danville 42,039 34,942 372 67 4,417 68 509 1,664 2,879 El Cerrito 23,549 12,543 1,819 107 6,439 37 1,079 1,525 2,621 Hercules 24,060 5,302 4,547 102 10,956 101 1,564 1,488 3,508 Lafayette 23,893 20,232 166 66 2,162 27 240 1,000 1,388 Martinez 35,824 27,603 1,303 255 2,876 121 1,425 2,241 5,258 Moraga 16,016 12,201 277 31 2,393 25 281 808 1,123 Oakley 35,432 22,641 2,582 314 2,236 142 4,998 2,519 12,364 Orinda 17,643 14,533 149 22 2,016 24 122 777 807 Pinole 18,390 8,488 2,458 147 4,220 64 1,741 1,272 4,005 Pittsburg 63,264 23,106 11,187 517 9,891 645 13,270 4,648 26,841 Pleasant Hill 33,152 24,846 686 127 4,516 66 1,079 1,832 4,009 Richmond 103,701 32,590 27,542 662 13,984 537 22,573 5,813 40,921 San Pablo 29,139 9,391 4,600 244 4,353 172 8,812 1,567 16,462 San Ramon 72,148 38,639 2,043 205 25,713 156 1,536 3,856 6,250 Walnut Creek 64,173 50,487 1,035 155 8,027 125 1,624 2,720 5,540 Census-designated places Total Population White African American Native American Asian Pacific Islander other races two or more races Hispanic or Latino (of any race) Acalanes Ridge 1,137 951 5 8 126 2 8 37 50 Alamo 14,570 12,662 73 18 1,190 22 126 479 839 Alhambra Valley 924 838 3 0 42 5 17 19 81 Bay Point 21,349 8,848 2,469 225 2,121 147 6,154 1,385 11,730 Bayview 1,754 871 186 18 369 9 179 122 521 Bethel Island 2,137 1,843 40 15 46 4 119 70 280 Blackhawk 9,354 6,882 172 15 1,801 8 75 401 464 Byron 1,277 911 61 11 4 11 224 55 503 Camino Tassajara 2,197 876 53 4 1,117 1 33 113 138 Castle Hill 1,299 1,112 29 1 110 2 9 36 78 Clyde 678 530 11 4 58 3 25 47 99 Contra Costa Centre 5,364 3,488 216 18 1,155 17 171 299 560 Crockett 3,094 2,468 146 31 108 24 123 194 490 Diablo 1,158 1,065 1 2 55 0 5 30 39 Discovery Bay 13,352 10,909 550 86 522 51 468 766 2,074 East Richmond Heights 3,280 1,995 395 13 407 8 187 275 465 El Sobrante 12,669 6,405 1,673 127 1,986 113 1,384 981 3,036 Kensington 5,077 3,963 131 15 610 2 58 298 263 Knightsen 1,568 1,268 14 8 28 3 162 85 454 Montalvin Manor 2,876 1,295 222 36 306 27 855 135 1,800 Mountain View 2,372 1,896 60 30 70 20 155 141 524 Norris Canyon 957 476 41 1 372 1 28 38 42 North Gate 679 566 1 0 65 0 19 28 56 North Richmond 3,717 634 1,239 23 431 18 1,191 181 1,862 Pacheco 3,685 2,814 78 27 366 11 201 188 619 Port Costa 190 172 2 2 7 0 0 7 10 Reliez Valley 3,101 2,693 31 4 233 2 30 108 192 Rodeo 8,679 3,823 1,410 53 1,762 62 885 684 2,134 Rollingwood 2,969 1,130 220 28 534 22 907 128 1,836 San Miguel 3,392 2,986 31 3 190 3 38 141 200 Saranap 5,202 4,275 70 15 451 10 113 268 437 Shell Ridge 959 821 5 2 73 6 8 44 59 Tara Hills 5,126 2,212 682 31 869 18 1,018 296 1,947 Vine Hill 3,761 2,568 111 33 196 35 561 257 1,169 Unincorporated communities Total Population White African American Native American Asian Pacific Islander other races two or more races Hispanic or Latino (of any race) All others not CDPs (combined) 9,882 7,630 391 88 475 17 825 456 2,025 2000[edit] As of the census[29] of 2000, there were 948,816 people, 344,129 households, and 242,266 families residing in the county. The population density was 1,318 people per square mile (509/km²). There were 354,577 housing units at an average density of 492 per square mile (190/km²). The largest ethnicites were 9.0% German, 7.7% Irish, 7.3% English and 6.5% Italian ancestry according to Census 2000. 74.1% spoke English, 13.1% Spanish, and 2.6% Tagalog By 2005, 53.2% of Contra Costa County's population were non-Hispanic whites. African-Americans made up 9.6% of the population, while Asians constituted 13.1% of it. Latinos were now 21.1% of the county population. In 2000, there were 344,129 households out of which 35.4% had children under the age of 18 living with them, 54.5% were married couples living together, 11.5% had a female householder with no husband present, and 29.6% were non-families. 22.9% of all households were made up of individuals and 8.00% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.23. In the county, the population was spread out with: 26.5% under the age of 18 7.7% from 18 to 24 30.6% from 25 to 44 23.9% from 45 to 64 11.3% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.4 males. For every 100 females age 18 and over, there were 92.2 males. The median income for a household in the county was $63,675, and the median income for a family was $73,039 (these figures had risen to $75,483 and $87,435 respectively as of a 2007 estimate).[30] Males had a median income of $52,670 versus $38,630 for females. The per capita income for the county was $30,615. About 5.4% of families and 7.6% of the population were below the poverty line, including 9.8% of those under age 18 and 6.0% of those age 65 or over. In 2000, the largest denominational groups were Catholics (with 204,070 adherents) and Evangelical Protestants (with 74,449 adherents).[31] The largest religious bodies were the Catholic Church (with 204,070 members) and The Baptist General Conference (with 24,803 members).[32] The Rohr Jewish Learning Institute teaches courses in the county.[33]


Politics[edit] Contra Costa County vote by party in presidential elections[34] Year GOP DEM Others 2016 24.51% 115,956 67.50% 319,287 7.99% 37,771 2012 31.09% 136,517 66.23% 290,824 2.69% 11,804 2008 30.10% 136,436 67.73% 306,983 2.17% 9,825 2004 36.46% 150,608 62.28% 257,254 1.25% 5,166 2000 37.06% 141,373 58.81% 224,338 4.14% 15,767 1996 35.15% 123,954 55.73% 196,512 9.11% 32,136 1992 29.51% 112,965 50.93% 194,960 19.56% 74,898 1988 47.86% 158,652 51.10% 169,411 1.04% 3,448 1984 54.48% 172,331 44.57% 140,994 0.95% 2,993 1980 50.12% 144,112 37.35% 107,398 12.53% 36,035 1976 49.35% 126,598 48.24% 123,742 2.41% 6,194 1972 54.13% 139,044 43.49% 111,718 2.38% 6,122 1968 44.53% 97,486 46.44% 101,668 9.02% 19,763 1964 36.47% 65,011 63.44% 113,071 0.09% 163 1960 46.82% 82,922 52.86% 93,622 0.33% 579 1956 50.98% 74,971 48.78% 71,733 0.24% 347 1952 49.61% 70,094 49.84% 70,416 0.56% 786 1948 40.45% 36,958 55.02% 50,277 4.53% 4,141 1944 35.86% 26,816 63.96% 47,831 0.18% 138 1940 37.22% 18,627 61.75% 30,900 1.03% 513 1936 26.70% 9,604 72.29% 26,007 1.01% 364 1932 37.33% 10,907 58.94% 17,218 3.73% 1,089 1928 60.38% 13,495 38.36% 8,573 1.26% 281 1924 54.67% 9,061 6.72% 1,114 38.61% 6,398 1920 63.75% 9,041 24.56% 3,483 11.69% 1,658 1916 44.05% 5,731 46.82% 6,092 9.13% 1,188 1912 0.48% 40 39.40% 3,290 60.12% 5,020 1908 60.61% 3,336 29.05% 1,599 10.34% 569 1904 62.55% 2,833 27.75% 1,257 9.69% 439 1900 57.02% 2,165 40.80% 1,549 2.19% 83 1896 56.10% 1,834 42.25% 1,381 1.65% 54 1892 51.79% 1,631 42.30% 1,332 5.90% 186 Like most of the Bay Area, Contra Costa County has become a Democratic stronghold, with even wealthy cities like Orinda and Walnut Creek voting Democratic in recent elections. The last Republican presidential candidate to win a majority in the county was Ronald Reagan in 1984. In the United States House of Representatives, Contra Costa County is split between four congressional districts:[35] California's 5th congressional district, represented by Democrat Mike Thompson California's 9th congressional district, represented by Democrat Jerry McNerney California's 11th congressional district, represented by Democrat Mark DeSaulnier California's 15th congressional district, represented by Democrat Eric Swalwell In the State Assembly, Contra Costa County is split between four districts: the 11th Assembly District, represented by Democrat Jim Frazier the 14th Assembly District, represented by Democrat Tim Grayson the 15th Assembly District, represented by Democrat Tony Thurmond the 16th Assembly District, represented by Republican Catharine Baker In the State Senate, the county is split between three districts: the 3rd Senate District, represented by Democrat Bill Dodd the 7th Senate District, represented by Democrat Steve Glazer the 9th Senate District, represented by Democrat Nancy Skinner Contra Costa County vote by party in gubernatorial elections Year GOP DEM 2014 31.4% 79,660 68.6% 174,403 2010 35.5% 123,606 60.6% 211,125 2006 52.4% 158,565 42.5% 128,578 2003 39.5% 114,187 38.4% 110,824 2002 35.7% 94,487 53.2% 140,975 1998 34.3% 103,686 62.8% 190,200 1994 51.5% 154,482 45.0% 135,133 1990 43.9% 119,901 52.9% 144,268 1986 63.3% 159,105 34.7% 87,117 1982 49.8% 126,460 47.2% 119,712 1978 35.8% 80,821 54.3% 122,565 1974 49.5% 99,470 48.3% 97,038 1970 53.2% 106,965 45.3% 91,156 1966 55.1% 107,543 44.9% 87,525 1962 43.3% 71,192 55.5% 91,150 According to the California Secretary of State, as of October 24, 2016, Contra Costa County has 607,515 registered voters, out of a population of 1,037,817 (58.5%). Of those, 306,029 (50.4%) are registered Democrats, 132,405 (21.8%) are registered Republicans, and 143,876 (23.7%) have declined to state a political party, also known as "No Party Preference" or "NPP."[36] Democrats hold wide voter-registration advantages in all political subdivisions in Contra Costa County, except for the affluent city of Danville. The Democrats' largest registration advantage in Contra Costa is in the cities of Richmond where there is a 60.3% registration advantage with only 3,192 Republicans (6.2%) out of 51,395 registered voters compared to 34,159 Democrats (66.5%) and 12,095 voters who have no party preference (23.5%), El Cerrito where there is a 59.0% registration advantage with only 1,169 Republicans (7.4%) out of 15,877 registered voters compared to 10,543 Democrats (67.6%) and 3,654 voters who have no party preference (23.0%), and San Pablo where there is a 58.3% registration advantage with only 641 Republicans (6.1%) out of 10,550 registered voters compared to 6,793 Democrats (64.4%) and 2,746 voters who have no party preference (26.0%). Voter registration statistics[edit] Population and registered voters Total population[16] 1,037,817   Registered voters[37][note 4] 607,515 58.5%     Democratic[37] 306,029 50.4%     Republican[37] 132,405 21.8%     Democratic–Republican spread[37] +131,650 +24.8%     American Independent[37] 15,795 2.6%     Green[37] 3,037 0.5%     Libertarian[37] 3,905 0.6%     Peace and Freedom[37] 1,439 0.2%     Other[37] 1,029 0.2%     No Party Preference ("NPP")[37] 143,876 23.7% Cities by population and voter registration[edit] Cities by population and voter registration City Population[16] Registered Voters[37] [note 4] Democratic[37] Republican[37] D–R Spread[37] Other[37] No Party Preference[37] Antioch 101,118 51,664 (51.1%) 28,784 (55.7%) 8,735 (16.9%) +38.8% 2,247 (4.3%) 11,898 (23.2%) Brentwood 48,582 31,914 (65.7%) 13,458 (42.2%) 9,846 (30.8%) +11.4% 1,484 (4.6%) 7,126 (22.3%) Clayton 10,856 7,901 (72.8%) 3,097 (39.2%) 2,885 (36.5%) +2.7% 357 (4.5%) 1,562 (19.8%) Concord 121,989 64,485 (52.9%) 31,634 (49.1%) 14,472 (22.4%) +26.7% 3,132 (4.9%) 15,247 (23.6%) Danville 41,994 29,621 (70.5%) 10,329 (34.9%) 11,448 (38.6%) -3.7% 1,174 (4.0%) 6,670 (22.5%) El Cerrito 23,482 15,877 (67.6%) 10,543 (66.4%) 1,169 (7.4%) +59.0% 511 (3.2%) 3,654 (23.0%) Hercules 23,556 14,044 (59.8%) 8,292 (59.0%) 1,720 (12.2%) +46.8% 422 (3.0%) 3,610 (25.7%) Lafayette 23,863 17,736 (74.3%) 8,323 (46.9%) 4,658 (26.3%) +20.6% 659 (3.7%) 4,096 (23.1%) Martinez 35,808 24,064 (67.2%) 11,900 (49.5%) 5,541 (23.0%) +26.5% 1,326 (5.5%) 5,297 (22.0%) Moraga 16,033 10,862 (67.7%) 4,638 (42.7%) 3,177 (29.2%) +13.5% 373 (3.4%) 2,674 (24.6%) Oakley 34,410 19,666 (57.2%) 9,872 (50.2%) 4,650 (23.7%) +26.5% 904 (4.6%) 4,240 (21.6%) Orinda 17,599 13,817 (78.5%) 6,583 (47.6%) 3,594 (26.0%) +21.6% 460 (3.3%) 3,180 (23.0%) Pinole 18,470 10,978 (59.4%) 6,440 (58.7%) 1,662 (15.1%) +43.6% 423 (3.9%) 2,453 (22.3%) Pittsburg 62,528 30,999 (49.6%) 18,285 (59.0%) 3,937 (12.7%) +46.3% 1,171 (3.8%) 7,606 (24.5%) Pleasant Hill 33,045 21,333 (64.6%) 10,401 (48.8%) 4,713 (22.1%) +26.7% 998 (3.0%) 5,221 (24.5%) Richmond 103,161 51,395 (49.8%) 34,159 (66.5%) 3,192 (6.2%) +60.3% 1,949 (3.8%) 12,095 (23.5%) San Pablo 29,224 10,550 (36.1%) 6,793 (64.4%) 641 (6.1%) +58.3% 370 (3.5%) 2,746 (26.0%) San Ramon 69,241 39,809 (57.5%) 16,175 (40.6%) 9,979 (25.1%) +15.5% 1,388 (3.5%) 12,267 (30.8%) Walnut Creek 64,168 45,783 (71.3%) 21,524 (47.0%) 12,040 (26.3%) +20.7% 1,755 (3.8%) 10,464 (22.9%) Unincorporated Areas 158,690 95,017 (59.9%) 44,799 (47.1%) 24,346 (25.6%) +21.5% 4,102 (4.3%) 21,770 (22.9%) TOTAL 1,037,817 607,515 (58.5%) 306,029 (50.4%) 132,405 (21.8%) +28.6% 25,205 (4.1%) 143,876 (23.7%)


Crime[edit] The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense. Population and crime rates Population[16] 1,037,817 Violent crime[38] 4,257 4.10   Homicide[38] 89 0.09   Forcible rape[38] 200 0.19   Robbery[38] 1,733 1.67   Aggravated assault[38] 2,235 2.15 Property crime[38] 19,843 19.12   Burglary[38] 7,361 7.09   Larceny-theft[38][39] 17,212 16.58   Motor vehicle theft[38] 6,492 6.26 Arson[38] 213 0.21 Cities by population and crime rates[edit] Cities by population and crime rates City Population[40] Violent crimes[40] Violent crime rate per 1,000 persons Property crimes[40] Property crime rate per 1,000 persons Antioch 105,009 1,068 10.17 4,757 45.30 Brentwood 52,811 99 1.87 1,185 22.44 Clayton 11,179 9 0.81 104 9.30 Concord 125,205 402 3.21 4,182 33.40 Danville 43,121 16 0.37 442 10.25 El Cerrito 24,156 128 5.30 1,022 42.31 Hercules 24,682 43 1.74 298 12.07 Lafayette 24,510 21 0.86 419 17.10 Martinez 36,729 70 1.91 930 25.32 Moraga 16,401 6 0.37 152 9.27 Oakley 36,348 85 2.34 477 13.12 Orinda 18,098 7 0.39 216 11.94 Pinole 18,864 91 4.82 674 35.73 Pittsburg 64,890 152 2.34 2,107 32.47 Pleasant Hill 34,001 73 2.15 1,621 47.68 Richmond 106,357 1,162 10.93 5,018 47.18 San Pablo 29,884 277 9.27 1,459 48.82 San Ramon 74,013 45 0.61 850 11.48 Walnut Creek 65,816 84 1.28 2,050 31.15


Economy[edit] Agriculture[edit] The great rancheros of the Spanish period were divided and sold for agricultural uses, with intensively irrigated farming made possible in some areas by the development of canals that brought water from the eastern riverside portions of the county to the central portion. Other areas could used the more limited water available from local creeks and from wells. Orchards dominated where such water was available, while other, seasonally dry areas were used for cattle ranching. In central parts of the county walnuts were an especially attractive orchard crop, using the thin-shelled English Walnut branches grafted to the hardy and disease-resistant American Walnut root stock. In the Moraga region, pears dominated, and many old (but untended) roadside trees are still picked seasonally by passers-by. In eastern county, stone fruit, especially cherries, is still grown commercially, with seasonal opportunities for people to pick their own fruit for a modest fee. Irrigation canals[edit] The Contra Costa Canal, a concrete-lined and fenced irrigation canal still makes a loop through central county and provided industrial and agricultural grade water to farms and industry. While no longer used for extensive irrigation, it is still possible for adjoining landowners (now large suburban lot owners) to obtain pumping permits. Most of this water is destined for the heavy industry near Martinez. As with the railroad rights of way there is now an extensive public trail system along these canals. Commuter railroads[edit] The development of commuter railroads proceeded together with the subdivision of farms into parcels. In some cases, such as the development of Saranap, the same developer controlled both the railroad (Sacramento Northern) and the development. These early suburbanization developments were an extension of the earlier development of trolley car suburbs in what are now considered the highly urban environments of the near East Bay. Heavy industry[edit] View of the Shell Martinez oil refinery Owing to its extensive waterfront on San Francisco, San Pablo, and Suisun bays the northwestern and northern segments have long been sites for heavy industry, including a number of still active oil refineries (particularly Chevron in Richmond, Shell Oil and Tesoro - in Martinez), chemical plants (Dow Chemical) and a once substantial integrated steel plant, Posco Steel (formerly United States Steel), now reduced to secondary production of strip sheet and wire. The San Joaquin River forms a continuation of the northern boundary turns southward to form the eastern boundary of the county. Some substantial Sacramento-San Joaquin Delta "islands" (actually leveed former marshes) are included in this corner of the county. Housing[edit] West County[edit] The West County is the area near or on San Francisco and San Pablo bays. The housing stock in the region was extensively developed after the great San Francisco earthquake of 1906. Much of the housing stock in these areas is becoming quite expensive. As an alternative to moving to either the expensive central county, or the too-distant East County, this area is becoming gentrified, with a mix of races and income levels — a character actively sought by some housing purchasers. The downside of this is a corresponding lack of affordable housing for those in lower paying service jobs — a problem endemic throughout the region. There has recently been a housing boom or tract housing in Richmond and also in the Hercules areas. These gentrifying areas are the most diverse in Contra Costa County. Central county[edit] Central county scene — Mount Diablo and portions of Concord, Pleasant Hill, and Walnut Creek, with former grasslands now an urban forest in low density suburbs with extensive business centers and residential buildings near BART locations (at the tall building groups). A recent (2007-8) development near the downtown Bart station consists of luxury apartments.> The central part of the county is a valley traversed by Interstate 680 and Highway 24. The towns east of the hills, on or near Highway 24 and their surrounding areas (Lafayette, Moraga and Orinda) are collectively known as Lamorinda. The major central county cities along Interstate 680 are Martinez, Concord, Pleasant Hill, Walnut Creek, Danville, San Ramon, and unincorporated Alamo. Owing to the high quality of its public schools (due largely to both demographics and added support from prosperous parents), this area has become a magnet for well–off families with children. During the real estate boom, housing prices were driven to astounding levels. From 2007, home prices in the region have seen substantial decreases and the affordability rate has risen. During the real estate boom, the high price of homes and scarcity of land resulted in many speculators purchasing older, smaller homes and partially or completely tearing them down to construct larger homes. In this way the central county region has become a mix of older suburbs, newer developments, small lot "infill" developments, and extensive shopping areas. Lafayette Reservoir East County[edit] Lower cost modern tract developments continue along Suisun Bay in the "East County" towns of Pittsburg, Antioch, and Oakley - new "bedroom" communities" to serve the now "edge cities". The median income of a family in the two relatively affluent East County towns of Brentwood and Discovery Bay is approaching $100k/yr. placing them in the top fifteen percent of affluent towns in the United States. California Distinguished Schools, golf courses, vineyards, and upscale homes are found in Brentwood and Discovery Bay. Discovery Bay is based on a waterfront community of 3,500+ homes with private docks with access to the Sacramento-San Joaquin River Delta. Discovery Bay also features gated and non-gated "off-water" communities with homes from 1,400 square feet (130 m2) up to 4,700 square feet (440 m2). The Streets of Brentwood, an outdoor lifestyle retail center, opened in Brentwood in the Fall of 2008. The Streets of Brentwood's upscale shops include Banana Republic, Coldwater Creek, DSW Shoes, Jos. A. Bank, REI, Swarovski, Victoria’s Secret, and White House/Black Market. The only all-digital Rave Motion Pictures in the San Francisco Bay Area is located in the Streets of Brentwood. In 2011, Vasco Road is undergoing further construction/improvement to reduce the driving time between East County/Brentwood and Livermore. Highway 4 is currently undergoing multimillion-dollar improvements that are scheduled to add lanes through Antioch and Pittsburg by 2015 to reduce the driving time between East County and Concord/Walnut Creek. Urban decay at the fringes[edit] Other cities in the once heavily industrialized northwestern and western waterfront areas such as Richmond have fallen on harder times, with Richmond having difficulty balancing its school budget.[citation needed] County budget problems[edit] Two forces have combined to create county budget problems peaking in 2008. First, (over a thirty-year period) rather than compensate police, medical, and firefighting personnel directly, very favorable health and retirement benefits were granted without proper actuarial examination, leading to unexpected (yet predictable) high costs as personnel age and ultimately retire with continued "first class" health and retirement benefits. Second, the collapse of the "housing bubble" has enabled purchasers of distressed properties (many of which are owned by banks and other mortgage holders) to petition for lower property assessments, in many cases reducing by half the revenue to the county for specific parcels. Continuing downturns in employment prospects (particularly in new housing construction) have further increased the needs for various social services. These deficits and demands, combined with a lack of support from a similarly stressed California state government and the United States Federal government have combined to require unpleasant choices to be made by county supervisors and county service providers in the allocation of limited resources in a time of increasing demand. The projected budget deficit is $45 million as of early 2011.[41] Perhaps more significantly, the total unfunded liability for retiree benefits is $2.4 billion.[42] Technical innovators[edit] In the 1970s and 1980s many small and innovative technical firms were started in this county, most of which are no longer present, having either failed, been absorbed into larger corporations, or having outgrown their original location are now elsewhere in the Bay Area.[citation needed] Corporate headquarters[edit] During the 1980s and early 1990s, many corporations that were formerly housed in the more central metropolitan area followed their employees by moving to large suburban and edge city office areas and office parks.[citation needed] A number of large corporations now have headquarters in large developments along what is called the 680 corridor, that segment of Interstate Highway 680 that extends from Concord in the north to San Ramon in the south, continuing into inland Alameda County from Dublin to Pleasanton.[citation needed] By the early 1990s, more square footage of office space had been built in the 680 corridor than in San Francisco's Financial District.[citation needed] Redevelopment[edit] There are currently political fights over the potential redevelopment of the county seat (Martinez), with long term residents and many elsewhere in the county concerned that it will lose its remaining small-town charm and utility in an effort to become more like the county's major recreational shopping center of Walnut Creek.[citation needed] The inland portions of the Concord Naval Weapons Station have been declared surplus by the Federal government and this area is expected to provide what is likely the last opportunity to plan and build city-sized development within the central county.[citation needed] This area will become a portion of the city of Concord, and planners expect that development will be confined to the lower and flatter portions of the depot, with the remainder becoming a substantial addition to the county's open space. Much of the land to be developed is relatively flat grassland and the most prominent structures are ammunition bunkers that will be removed, so future uses of the property are largely unconstrained by previous uses.[43]


Education[edit] Contra Costa County Library is the county's library system.


Media[edit] The city of Concord is served by the daily newspaper, the Contra Costa Times published by the Bay Area News Group-East Bay (part of the Media News Group, Denver, Colorado), with offices in Walnut Creek. The paper was originally a paper run and owned by the Lesher family. Since the death of Dean Lesher in 1993, the paper has had several owners.[44] The publisher also issues weekly local papers, such as the Concord Transcript, which is the local paper for Concord and nearby Clayton.


Transportation[edit] This article needs to be updated. Please update this article to reflect recent events or newly available information. (May 2015) Prior to 1903 most travel to central Contra Costa County was by boat or rail to Martinez on the northern waterfront and from there to the industrial areas east along the waterfront as well as farming regions to the south. In 1903 the first tunnel through the Oakland hills (now Old Tunnel Road) was built, principally as a means of bringing hay by horse, mule, or ox-drawn wagons from central and eastern agricultural areas to feed the draft animals that provided the power to public and private transportation in the East Bay at the time. The tunnel exited in the hills high above the crossroads of Orinda with the road continuing on to Lafayette, Walnut Creek, and Danville. The road was just wide enough for one car in each direction, and had no shoulders. In 1937 the two-bore Caldecott Tunnel for road vehicles was completed, making interior Contra Costa County much more accessible. After World War II the tunnels allowed waves of development to proceed, oriented toward Oakland rather than the northern shoreline, and the northern shoreline cities began to decline. The tunnel has since been augmented with a third bore, completed in 1964, and a fourth, completed in 2013. Major highways[edit] Interstate 80 Interstate 580 Interstate 680 State Route 4 State Route 24 State Route 160 State Route 242 San Pablo Avenue – formerly U.S. Route 40 Mass transit[edit] Amtrak runs its San Joaquins line to Southern California and Capitol Corridor line to Sacramento and San Jose through stations in Richmond, Martinez, and Antioch-Pittsburg. BART High speed commuter rail system, which functions as the Bay Area's metro system. eBART (short for East Contra Costa County BART Extension) is designed to bring rapid transit services along the Highway 4 corridor. AC Transit provides local service in West County and in Orinda, in addition to western Alameda County, Transbay commuter services to San Francisco, bus rapid transit lines and the bulk of All Nighter service for the East Bay. County Connection provides local service in Central C.C. County and connecting services to Dublin and Pittsburg. Tri-Delta Transit provides local bus service in East C.C. County and connecting regional services to Martinez, Livermore, and Stockton. WestCAT provides local bus service in northern West C.C. County with connecting service to BART and transbay service to the city (San Francisco). Golden Gate Transit provides connecting transbay service between San Rafael and Richmond and El Cerrito del Norte BART stations via the Richmond-San Rafael Bridge. Vallejo Transit and Fairfield and Suisun Transit provide regional feeder service to El Cerrito del Norte BART from Solano County. Benicia Transit provides commuter service between the Vallejo Ferry Terminal and BART in Concord through Benicia in Solano County. Airports[edit] The county also has two airports that are not currently providing passenger service: Buchanan Field Airport, located in Concord Byron Airport, located two miles (3 km) south of Byron Railroads[edit] The western termini of several original transcontinental railroad routes have been located in Oakland, in Alameda County, Including Union Pacific, Southern Pacific, and Santa Fe railroads. From Oakland, there are two primary routes east: The former Southern Pacific (originally Central Pacific Railroad) line north through Richmond, closely hugging the San Pablo Bay coastline to Martinez, where it crosses Suisun Bay on a drawbridge before proceeding to Sacramento and the crossing of the Sierra Nevada via Donner Pass The former Western Pacific Railroad line, which runs east through Niles Canyon, Livermore and over Altamont Pass, en route in a north-easterly direction to Sacramento and the Feather River canyon/Beckwourth Pass crossing of the Sierra Nevada Formed in 1909, the Oakland Antioch Railway was renamed the Oakland Antioch & Eastern Railway in 1911. It extended through a 3,400-foot (1,000 m) tunnel in the Oakland Hills, from Oakland to Walnut Creek, Concord and on to Bay Point. The current owner of the Santa Fe Railroad's assets, BNSF Railway has the terminus of its transcontinental route in Richmond. Originally built by the San Francisco and San Joaquin Valley Railroad in 1896, the line was purchased by the Atchison, Topeka and Santa Fe Railway shortly thereafter. The line leaves Richmond through industrial and residential parts of West County before striking due east through Franklin Canyon and Martinez on its way to Stockton, Bakersfield and Barstow. These railroads spurred the development of industry in the county throughout the late 19th and early 20th centuries, particularly driving development of the Standard Oil (now Chevron) refinery and port complex in Richmond. There were a large number of short lines in the county between the late 19th century and the early 20th century. The rights of way of a number of these railroads also served as utility rights of way, particularly for water service, and so were preserved, and in the late 20th century enhanced as walking, jogging, and bicycle riding trails in the central portion of the county.


Attractions[edit] Black Diamond Mines Regional Preserve Blackhawk Museum[45] (This site also contains a paleontological museum of the University of California, Berkeley) John Marsh House (not open to the public) [46] Eugene O'Neill National Historic Site John Muir National Historic Site Lindsay Wildlife Museum Don Francisco Galindo House Don Salvio Pacheco Adobe Martinez Adobe[47] San Ramon Valley Museum[48] Borges Ranch[49] Richmond Museum of History Rosie the Riveter/World War II Home Front National Historical Park Vasco Caves Regional Preserve


Parks and recreation[edit] Briones Regional Park[50] Diablo Foothills[51] Howe Homestead Park[52] Marsh Creek State Park - not open to the public Mount Diablo State Park Las Trampas Regional Wilderness[53] Shell Ridge Open Space[54] Lime Ridge Open Space[55] San Pablo Recreation Area (San Pablo Dam Reservoir)[56] Sugarloaf Open Space[57] Acalanes Open Space[58] Point Isabel Regional Shoreline in Richmond is the largest dog park in the country. Adjoining or nearby these parks are lands of the East Bay Municipal Utility District. These require special annual permits for hiking, bicycle riding and horse riding, available for a small fee. At least one member of a party traversing these areas must have such a permit. Trails[edit] Iron Horse Regional Trail[59] California State Riding and Hiking Trail[60] Contra Costa Canal Regional Trail[61] Delta de Anza Regional Trail[62] Briones-Mount Diablo Regional Trail[63] Lafayette-Moraga Regional Trail[64] #Marsh Creek Regional Trail American Discovery Trail Hiking trails in Contra Costa County


Utilities[edit] Central Contra Costa Sanitary District East Bay Municipal Utility District


California casino proposals[edit] Since 2003, four Indian gaming casinos have been proposed in Richmond and the surrounding area of West Contra Costa County. Proposals[edit] Hilltop Mall, to be built on a 10-acre (0.040 km2) site Lytton Rancheria at Casino San Pablo from the Scotts Valley band of the Pomo tribe and have 2,500 (originally 5,000) slot machines Point Molate Casino Resort to have a luxury shopping mall, 1,100 room hotel/resort North Richmond to be located on a 23-acre (0.093 km2) site and have a buffet


Communities[edit] Martinez Court House, California Cities[edit] Antioch Brentwood Clayton Concord Danville El Cerrito Hercules Lafayette Martinez (county seat) Moraga Oakley Orinda Pinole Pittsburg Pleasant Hill Richmond San Pablo San Ramon Walnut Creek Census-designated places[edit] Acalanes Ridge Alamo Alhambra Valley Bay Point Bayview Bethel Island Blackhawk Byron Camino Tassajara Castle Hill Clyde Contra Costa Centre Crockett Diablo Discovery Bay East Richmond Heights El Sobrante Kensington Knightsen Montalvin Manor Mountain View Norris Canyon North Gate North Richmond Pacheco Port Costa Reliez Valley Rodeo Rollingwood Saranap San Miguel Shell Ridge Tara Hills Vine Hill Unincorporated communities[edit] Canyon Hasford Heights Former communities[edit] Bayview-Montalvin Port Chicago Ghost towns[edit] Judsonville Nortonville Point of Timber Landing Somersville Stewartville West Hartley Other places[edit] Saranap - an unincorporated residential area between Walnut Creek and Lafayette, centered around the site of a (now-gone) inter-urban train station, comprising much of ZIP Code 94595. Rossmoor - a senior development incorporated into Walnut Creek (not to be confused with the Southern California Rossmoor). Livorna Population ranking[edit] The population ranking of the following table is based on the 2010 census of Contra Costa County.[65] † county seat Rank City/Town/etc. Municipal type Population (2010 Census) 1 Concord City 122,067 2 Richmond City 103,701 3 Antioch City 102,372 4 San Ramon City 72,148 5 Walnut Creek City 64,173 6 Pittsburg City 63,264 7 Brentwood City 51,481 8 Danville Town 42,039 9 † Martinez City 35,824 10 Oakley City 35,432 11 Pleasant Hill City 33,152 12 San Pablo City 29,139 13 Hercules City 24,060 14 Lafayette City 23,893 15 El Cerrito City 23,549 16 Bay Point CDP 21,349 17 Pinole City 18,390 18 Orinda City 17,643 19 Moraga Town 16,016 20 Alamo CDP 14,570 21 Discovery Bay CDP 13,352 22 El Sobrante CDP 12,669 23 Clayton City 10,897 24 Blackhawk CDP 9,354 25 Rodeo CDP 8,679 26 Contra Costa Centre CDP 5,364 27 Saranap CDP 5,202 28 Tara Hills CDP 5,126 29 Kensington CDP 5,077 30 Vine Hill CDP 3,761 31 North Richmond CDP 3,717 32 Pacheco CDP 3,685 33 San Miguel CDP 3,392 34 East Richmond Heights CDP 3,280 35 Reliez Valley CDP 3,101 36 Crockett CDP 3,094 37 Rollingwood CDP 2,969 38 Montalvin Manor CDP 2,876 39 Mountain View CDP 2,372 40 Camino Tassajara CDP 2,197 41 Bethel Island CDP 2,137 42 Bayview CDP 1,754 43 Knightsen CDP 1,568 44 Castle Hill CDP 1,299 45 Byron CDP 1,277 46 Diablo CDP 1,158 47 Acalanes Ridge CDP 1,137 48 Shell Ridge CDP 959 49 Norris Canyon CDP 957 50 Alhambra Valley CDP 924 51 North Gate CDP 679 52 Clyde CDP 678 53 Port Costa CDP 190


See also[edit] San Francisco Bay Area portal National Register of Historic Places listings in Contra Costa County, California List of museums in San Francisco Bay Area, California Stege, California, former unincorporated area within the county


Notes[edit] ^ For a collection of observations of the Mexican provincial culture and trading practice (most notably in the acquisition of cattle hides for eastern U.S. shoe manufacturies) see portions of Two Years Before the Mast, a first-person narrative of a seaman's voyage to California starting in 1834. ^ Other = Some other race + Two or more races ^ Native American = Native Hawaiian or other Pacific Islander + American Indian or Alaska Native ^ a b Percentage of registered voters with respect to total population. Percentages of party members with respect to registered voters follow.


References[edit] ^ "Chronology". California State Association of Counties. Retrieved February 6, 2015.  ^ "Mount Diablo". Peakbagger.com. Retrieved February 6, 2015.  ^ a b c "State & County QuickFacts". United States Census Bureau. Retrieved April 3, 2016.  ^ a b "Population and Housing Unit Estimates". Retrieved June 9, 2017.  ^ "Contra Costa County, California Official Website". Retrieved 2009-01-24.  ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved 2011-06-07.  ^ "Contra Costa County, California Official Website - Visiting". Archived from the original on February 27, 2009. Retrieved 2009-01-24.  ^ "Contra Costa County Mexican Land Grants". Lib.berkeley.edu. 2003-06-16. Retrieved 2012-09-22.  ^ U.S. 1850 California Census asks state of birth of all residents and gets about 7300 residents born in California. Adding the approximate 200 Hispanics known to be in San Francisco (1846 directory) and an unknown (but small as shown in 1852 CA Census recount) number in Contra Costa and Santa Clara county whose census was lost gives less than 9,000 Hispanics state wide. ^ Lyman, George D. John Marsh, Pioneer: The Life Story of a Trail-blazer on Six Frontiers, pp. 237-49, The Chautauqua Press, Chaugauqua, New York, 1931. ^ U.S. 1850 California Census counts 92,597 residents but omits the residents of San Francisco (estimated at about 21,000) whose census records were destroyed by fire. Contra Costa County (estimated at about 2,000 residents) and Santa Clara County (estimated at about 4,000 residents) 1850 records were "lost" and also not included. ^ Historical Statistics of the United States--1850-California,, which includes a summary of the state's 1852 state census ^ [1] Archived June 9, 2007, at the Wayback Machine. ^ "East Bay Regional Parks | Embrace Life!". Ebparks.org. Retrieved 2012-09-22.  ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Retrieved September 24, 2015.  ^ a b c d e f g h i j k l m n o p q U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B02001. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-26. ^ a b U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B03003. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-26. ^ a b U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B19301. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-21. ^ a b U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B19013. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-21. ^ a b U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B19113. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-21. ^ a b U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-21. ^ U.S. Census Bureau. American Community Survey, 2011 American Community Survey 5-Year Estimates, Table B01003. American FactFinder Archived September 11, 2013, at the Wayback Machine.. Retrieved 2013-10-21. ^ "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved September 24, 2015.  ^ "Historical Census Browser". University of Virginia Library. Retrieved September 24, 2015.  ^ Forstall, Richard L., ed. (March 27, 1995). "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved September 24, 2015.  ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Retrieved September 24, 2015.  ^ "2010 Census P.L. 94-171 Summary File Data". United States Census Bureau.  ^ "Demographic Profile Bay Area Census". Archived from the original on 1996-12-27.  ^ "American FactFinder". United States Census Bureau. Archived from the original on September 11, 2013. Retrieved 2011-05-14.  ^ "Contra Costa County, California - Fact Sheet - American FactFinder". Factfinder.census.gov. Retrieved 2012-09-22.  ^ "County Membership Reports". thearda.com. Retrieved 2011-08-22.  ^ "County Membership Reports". thearda.com. Retrieved 2010-08-22.  ^ Berkowitz, Dovber (October 21, 2015). "Where Does the Soul Go After It Departs This World?".  ^ http://uselectionatlas.org/RESULTS/index.html ^ "Counties by County and by District". California Citizens Redistricting Commission. Retrieved September 24, 2014.  ^ [2] ^ a b c d e f g h i j k l m n o p Contra Costa County Elections Division. [3]. Retrieved 2016-11-29. ^ a b c d e f g h i j Office of the Attorney General, Department of Justice, State of California. Table 11: Crimes – 2009 Archived December 2, 2013, at the Wayback Machine.. Retrieved 2013-11-14. ^ Only larceny-theft cases involving property over $400 in value are reported as property crimes. ^ a b c United States Department of Justice, Federal Bureau of Investigation. Crime in the United States, 2012, Table 8 (California). Retrieved 2013-11-14. ^ "CBS News article". January 31, 2011. Retrieved 2011-03-02.  ^ "CCTimes article". February 5, 2012. Retrieved 2012-02-05.  ^ http://www.concordreuseproject.org/about/ ^ Hall, Carl (August 25, 2005) "East Bay Newspaper Chain Sold", S.F. Chronicle. Retrieved 2007-08-16. ^ "blackhawkmuseum.org". blackhawkmuseum.org. 2012-11-17. Retrieved 2012-11-22.  ^ [4] Archived October 18, 2005, at the Wayback Machine. ^ chinn, harvey. "The Martinez Adobe - John Muir National Historic Site - John Muir Exhibit (John Muir Education Project, Sierra Club California)".  ^ "Museum of the San Ramon Valley". museumsrv.org. Retrieved 2012-11-22.  ^ [5] Archived October 16, 2015, at the Wayback Machine. ^ "Briones Regional Park". Ebparks.org. Retrieved 2012-09-22.  ^ "Diablo Foothills Regional Park". Ebparks.org. 2012-09-27. Retrieved 2012-11-22.  ^ [6] Archived November 18, 2014, at the Wayback Machine. ^ "Las Trampas Regional Wilderness". Ebparks.org. Retrieved 2012-11-22.  ^ [7] Archived March 19, 2015, at the Wayback Machine. ^ [8] Archived October 16, 2015, at the Wayback Machine. ^ [9] Archived December 12, 2012, at the Wayback Machine. ^ [10] Archived November 18, 2014, at the Wayback Machine. ^ [11][dead link] ^ "Iron Horse Regional Trail". Ebparks.org. 2012-10-17. Retrieved 2012-11-22.  ^ "California Riding and Hiking Trail". Ebparks.org. Retrieved 2012-11-22.  ^ "Contra Costa Canal Trail". Ebparks.org. 2012-09-13. Retrieved 2012-11-22.  ^ "Delta de Anza Regional Trail". Ebparks.org. Retrieved 2012-11-22.  ^ "Briones to Mt. Diablo Regional Trail". Ebparks.org. Retrieved 2012-11-22.  ^ "Lafayette-Moraga Regional Trail". Ebparks.org. Retrieved 2012-11-22.  ^ "Archived copy". Archived from the original on December 21, 2013. Retrieved 2015-12-29. 


External links[edit] Wikivoyage has a travel guide for Contra Costa County. Wikimedia Commons has media related to Contra Costa County, California. Official website Contra Costa County Library Contra Costa County Office of Education - ROP Contra Costa Health Services ContraCostaMeansBusiness.com - Contra Costa County's Business Portal Contra Costa Countywide Youth Commission (CYC) Contra Costa County Historical Society Halfway To Concord = Contra Costa News, Politics, Business, Events Calendar California State Association of Counties (CSAC) Coordinates: 37°56′N 121°57′W / 37.93°N 121.95°W / 37.93; -121.95 Places adjacent to Contra Costa County, California Sonoma County[1][2] Solano County Sacramento County Marin County Contra Costa County San Joaquin County San Francisco County Alameda County v t e Municipalities and communities of Contra Costa County, California, United States County seat: Martinez Cities and towns Antioch Brentwood Clayton Concord Danville El Cerrito Hercules Lafayette Martinez Moraga Oakley Orinda Pinole Pittsburg Pleasant Hill Richmond San Pablo San Ramon Walnut Creek CDPs Acalanes Ridge Alamo Alhambra Valley Bay Point Bayview Bethel Island Blackhawk Byron Camino Tassajara Castle Hill Clyde Contra Costa Centre Crockett Diablo Discovery Bay East Richmond Heights El Sobrante Kensington Knightsen Montalvin Manor Mountain View Norris Canyon North Gate North Richmond Pacheco Port Costa Reliez Valley Rodeo Rollingwood San Miguel Saranap Shell Ridge Tara Hills Vine Hill Unincorporated communities Alamo Oaks Arbor Avon Bancroft Bayo Vista Bayview-Montalvin Bixler Blackhawk-Camino Tassajara Bridgehead Canyon Christie Cornwall Crolona Heights Diamond Eastport Four Corners Franklin Canyon Gateley Glen Frazer Hasford Heights Herpoco Hookston Las Juntas Los Medanos Luzon Maltby Marsh Creek Springs McAvoy Meinert Monsanto Muir Neroly Newlove Nichols Oleum Orwood Ozol Rheem Rock City Selby Shore Acres Sobrante Sparkle Stege Tassajara Tormey Valle Vista Valona Waldon Walnut Heights Werner Ghost towns Acelanus Ambrose Atchison Eckley Empire Giant (Nitro) Hooper Horse Haven Judsonville Junction Nortonville Ohmer Point of Timber Port Chicago Schmidtville Somersville Stewartville Tammukan West Hartley Winehaven v t e East Bay Counties Alameda Contra Costa Major cities Oakland Fremont Hayward Concord Berkeley Richmond Antioch Cities and towns 25k-100k Alameda Brentwood Castro Valley Danville Dublin Livermore Martinez Newark Oakley Pittsburg Pleasant Hill Pleasanton San Leandro San Pablo San Ramon Union City Walnut Creek Cities and towns 10k-25k Alamo Albany Ashland Bay Point Cherryland Clayton Discovery Bay El Cerrito El Sobrante Emeryville Fairview Hercules Lafayette Moraga Orinda Piedmont Pinole San Lorenzo Cities and towns under 10k Bayview Bethel Island Blackhawk Byron Camino Tassajara Clyde Crockett Diablo East Richmond Heights Kensington Knightsen Montalvin Manor Mountain View Pacheco Port Costa Rodeo Rollingwood Sunol Tara Hills Vine Hill Regional organizations AC Transit East Bay Municipal Utility District East Bay Regional Park District East Bay Tribune East Bay Electric Lines (historic) East Bay Green Corridor v t e San Francisco Bay Area Bodies of water Bodega Bay Carquinez Strait Clifton Forebay Golden Gate Grizzly Bay Guadalupe River Half Moon Bay Lake Berryessa Napa River Oakland Estuary Petaluma River Richardson Bay Richmond Inner Harbor Russian River Sacramento River San Francisco Bay San Leandro Bay San Pablo Bay Sonoma Creek Suisun Bay Tomales Bay Counties Alameda Contra Costa Marin Napa San Francisco San Mateo Santa Clara Solano Sonoma Major cities San Jose San Francisco Oakland Cities and towns 100k–250k Antioch Berkeley Concord Daly City Fairfield Fremont Hayward Richmond Santa Clara Santa Rosa Sunnyvale Vallejo Cities and towns 50k–99k Alameda Brentwood Castro Valley Cupertino Livermore Milpitas Mountain View Napa Novato Palo Alto Petaluma Pittsburg Pleasanton Redwood City San Leandro San Mateo San Rafael San Ramon South San Francisco Union City Vacaville Walnut Creek Cities and towns 25k-50k Belmont Benicia Burlingame Campbell Danville Dublin East Palo Alto Foster City Gilroy Los Altos Los Gatos Martinez Menlo Park Morgan Hill Newark Oakley Pacifica Pleasant Hill Rohnert Park San Bruno San Carlos San Pablo Saratoga Suisun City Windsor Cities and towns 10k–25k Alamo Albany American Canyon Ashland Bay Point Cherryland Clayton Discovery Bay Dixon El Cerrito El Sobrante Emeryville Fairview Half Moon Bay Healdsburg Hercules Hillsborough Lafayette Larkspur Millbrae Mill Valley Moraga North Fair Oaks Orinda Piedmont Pinole San Anselmo San Lorenzo Sonoma Stanford Tamalpais-Homestead Valley Sub-regions East Bay North Bay San Francisco Peninsula Silicon Valley South Bay Politics Sports Transportation v t e  State of California Sacramento (capital) Topics Culture Food Music Myth Sports Demographics Earthquakes Economy Education Environment Geography Climate Ecology Flora Fauna Government Capitol Districts Governor Legislature Supreme Court Healthcare History Law National Historic Landmarks National Natural Landmarks NRHP listings Politics Congressional delegations Elections People Protected areas State Parks State Historic Landmarks Symbols Transportation Water Index of articles Regions Antelope Valley Big Sur California Coast Ranges Cascade Range Central California Central Coast Central Valley Channel Islands Coachella Valley Coastal California Conejo Valley Cucamonga Valley Death Valley East Bay (SF Bay Area) East County (SD) Eastern California Emerald Triangle Gold Country Great Basin Greater San Bernardino Inland Empire Klamath Basin Lake Tahoe Greater Los Angeles Los Angeles Basin Lost Coast Mojave Desert Mountain Empire North Bay (SF) North Coast North Coast (SD) Northern California Owens Valley Oxnard Plain Peninsular Ranges Pomona Valley Sacramento Valley Salinas Valley San Fernando Valley San Francisco Bay Area San Francisco Peninsula San Gabriel Valley San Joaquin Valley Santa Clara Valley Santa Clara River Valley Santa Clarita Valley Santa Ynez Valley Shasta Cascade Sierra Nevada Silicon Valley South 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146570365 ISNI: 0000 0004 0442 5823 GND: 1042169845 ^ Marin, Solano, Sonoma and Contra Costa Counties' borders come to a common point c. 6 miles into San Francisco Bay (coming from the north). Thus, Sonoma County is an adjacent county. Hittell, Theodore Henry (1876). The codes and statutes of the State of California. A. L. Bancroft. p. 515. Retrieved August 20, 2012.  ^ "California Codes, Government Codes". Retrieved August 20, 2012.  |section= ignored (help) Retrieved from "https://en.wikipedia.org/w/index.php?title=Contra_Costa_County,_California&oldid=823303110" Categories: California countiesContra Costa County, CaliforniaCounties in the San Francisco Bay Area1850 establishments in CaliforniaPopulated places established in 1850Hidden categories: Webarchive template wayback linksAll articles with dead external linksArticles with dead external links from September 2012Articles needing additional references from October 2016All articles needing additional referencesUse mdy dates from November 2014Articles containing Spanish-language textAll articles with unsourced statementsArticles with unsourced statements from November 2016Wikipedia articles in need of updating from May 2015All Wikipedia articles in need of updatingPages using div col without cols and colwidth parametersPages using div col with deprecated parametersCoordinates on WikidataWikipedia articles with VIAF identifiersWikipedia articles with ISNI identifiersWikipedia articles with GND identifiersCS1 errors: chapter ignored


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Contra_Costa_County,_California - Photos and All Basic Informations

Contra_Costa_County,_California More Links

Wikipedia:VerifiabilityHelp:Introduction To Referencing With Wiki Markup/1Help:Maintenance Template RemovalCounty (United States)The West Face Of Mount Diablo, The Most Notable Natural Landmark In Contra Costa CountyMount DiabloOfficial Seal Of Contra Costa CountyLocation In The State Of CaliforniaCalifornia's Location In The United StatesList Of Sovereign StatesU.S. StateCaliforniaList Of Regions Of CaliforniaSan Francisco Bay AreaMunicipal CorporationNamesakeSpanish LanguageSan Francisco BayCounty SeatMartinez, CaliforniaConcord, CaliforniaRichmond, California2010 United States CensusTime ZonePacific Time ZoneUTC-8Daylight Saving TimePacific Daylight TimeUTC-7North American Numbering PlanArea Code 510Area Code 925Federal Information Processing StandardGeographic Names Information SystemCounty (United States)California2010 United States CensusCounty SeatMartinez, CaliforniaEast Bay (San Francisco Bay Area)San Francisco Bay AreaSuburbanSan Francisco–Oakland–Hayward, CA Metropolitan Statistical AreaMioceneGeologic TimescaleSavannaMammalsFossilGeologic TimescaleSandstoneLimestoneVolcanoesTerraneSan Francisco Bay AreaMount Diablo State ParkPlate TectonicsFranciscan AssemblagePillow LavaPre-Columbian EraHomo SapiensMetalsObsidianNomadGreat PlainsSpanish Missions Of CaliforniaPresidio Of San FranciscoMexican War Of IndependenceRancho AcalanesRancho Arroyo De Las Nueces Y BolbonesRancho Boca De La Canada Del PinoleRancho Canada Del Hambre Y Las BolsasRancho Canada De Los VaquerosRancho Laguna De Los Palos ColoradosRancho Las JuntasRancho Los MedanosRancho Los MeganosRancho Monte Del DiabloRancho El PinoleRancho San PabloRancho San Ramon (Amador)Rancho San Ramon (Pacheco-Castro)Rancho El SobranteRancho Canada De Los VaquerosRancho San Ramon (Pacheco-Castro)Rancho San Ramon (Amador)Rancho Monte Del DiabloConcord, CaliforniaPacheco, CaliforniaClayton, CaliforniaMount DiabloRancho Arroyo De Las Nueces Y BolbonesRancho San MiguelWalnut Creek, CaliforniaRancho Los 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SystemHayward Fault ZoneCalaveras FaultConcord FaultClayton-Marsh Creek-Greenville FaultFault (geology)Diablo FaultDanville, CaliforniaAntioch Dunes National Wildlife RefugeEugene O'Neill National Historic SiteJohn Muir National Historic SiteRosie The Riveter/World War II Home Front National Historical ParkEnlargeMount DiabloMount DiabloDiablo RangeMount Diablo State ParkConcord Naval Weapons StationLos Vaqueros ReservoirMorgan TerritoryBrushy Peak Regional PreserveVasco Caves Regional PreserveRound Valley Regional PreserveBlack Diamond Mines Regional PreserveAcalanes Ridge, CaliforniaCensus-designated PlaceAlamo, CaliforniaCensus-designated PlaceAlhambra Valley, CaliforniaCensus-designated PlaceAntioch, CaliforniaList Of Cities And Towns In CaliforniaBay Point, CaliforniaCensus-designated PlaceBayview, Contra Costa County, CaliforniaCensus-designated PlaceBethel Island, CaliforniaCensus-designated PlaceBlackhawk, CaliforniaCensus-designated PlaceBrentwood, CaliforniaList Of Cities And 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CaliforniaList Of Cities And Towns In California1860 United States Census1870 United States Census1880 United States Census1890 United States Census1900 United States Census1910 United States Census1920 United States Census1930 United States Census1940 United States Census1950 United States Census1960 United States Census1970 United States Census1980 United States Census1990 United States Census2000 United States Census2010 United States Census2010 United States CensusWhite (U.S. Census)African American (U.S. Census)Native American (U.S. Census)Asian (U.S. Census)Pacific Islander (U.S. Census)Race (United States Census)Hispanic (U.S. Census)Latino (U.S. Census)Mexican AmericanSalvadoran American2010 United States CensusWhite (U.S. Census)African American (U.S. Census)Native American (U.S. Census)Asian (U.S. Census)Pacific Islander (U.S. Census)Race (United States Census)Hispanic (U.S. Census)Latino (U.S. Census)Incorporated CityWhite (U.S. Census)African American (U.S. Census)Native American (U.S. Census)Asian (U.S. Census)Pacific Islander (U.S. Census)Race (United States Census)Hispanic (U.S. Census)Latino (U.S. Census)Antioch, CaliforniaBrentwood, CaliforniaClayton, CaliforniaConcord, CaliforniaDanville, CaliforniaEl Cerrito, CaliforniaHercules, CaliforniaLafayette, CaliforniaMartinez, CaliforniaMoraga, CaliforniaOakley, CaliforniaOrinda, CaliforniaPinole, CaliforniaPittsburg, CaliforniaPleasant Hill, CaliforniaRichmond, CaliforniaSan Pablo, CaliforniaSan Ramon, CaliforniaWalnut Creek, CaliforniaCensus-designated PlaceWhite (U.S. Census)African American (U.S. Census)Native American (U.S. Census)Asian (U.S. Census)Pacific Islander (U.S. Census)Race (United States Census)Hispanic (U.S. Census)Latino (U.S. Census)Acalanes Ridge, CaliforniaAlamo, CaliforniaAlhambra Valley, CaliforniaBay Point, CaliforniaBayview, Contra Costa County, CaliforniaBethel Island, CaliforniaBlackhawk, CaliforniaByron, CaliforniaCamino Tassajara, CaliforniaCastle Hill, CaliforniaClyde, CaliforniaContra Costa Centre, CaliforniaCrockett, CaliforniaDiablo, CaliforniaDiscovery Bay, CaliforniaEast Richmond Heights, CaliforniaEl Sobrante, CaliforniaKensington, CaliforniaKnightsen, CaliforniaMontalvin Manor, CaliforniaMountain View, Contra Costa County, CaliforniaNorris Canyon, CaliforniaNorth Gate, CaliforniaNorth Richmond, CaliforniaPacheco, CaliforniaPort Costa, CaliforniaReliez Valley, CaliforniaRodeo, CaliforniaRollingwood, CaliforniaSan Miguel, Contra Costa County, CaliforniaSaranap, CaliforniaShell Ridge, CaliforniaTara Hills, CaliforniaVine Hill, CaliforniaUnincorporated AreaWhite (U.S. Census)African American (U.S. Census)Native American (U.S. Census)Asian (U.S. Census)Pacific Islander (U.S. Census)Race (United States Census)Hispanic (U.S. Census)Latino (U.S. Census)CensusPopulation DensityCensus 2000Tagalog LanguagePer Capita IncomePoverty LineCatholicsEvangelical ProtestantBaptist General ConferenceRohr Jewish Learning InstituteRepublican Party (United 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States)California Gubernatorial Election, 2014California Gubernatorial Election, 2010California Gubernatorial Election, 2006California Gubernatorial Election, 2003California Gubernatorial Election, 2002California Gubernatorial Election, 1998California Gubernatorial Election, 1994California Gubernatorial Election, 1990California Gubernatorial Election, 1986California Gubernatorial Election, 1982California Gubernatorial Election, 1978California Gubernatorial Election, 1974California Gubernatorial Election, 1970California Gubernatorial Election, 1966California Gubernatorial Election, 1962Secretary Of State Of CaliforniaCalifornia Democratic PartyCalifornia Republican PartyDecline To StateDanville, CaliforniaRichmond, CaliforniaEl Cerrito, CaliforniaSan Pablo, CaliforniaAntioch, CaliforniaBrentwood, CaliforniaClayton, CaliforniaConcord, CaliforniaDanville, CaliforniaEl Cerrito, CaliforniaHercules, CaliforniaLafayette, CaliforniaMartinez, CaliforniaMoraga, CaliforniaOakley, 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A Recent (2007-8) Development Near The Downtown Bart Station Consists Of Luxury Apartments.>File:DinoHillPano2731x505.jpgMount Diablo State ParkUrban ForestLafayette, CaliforniaMoraga, CaliforniaOrinda, CaliforniaEnlargeLafayette ReservoirSuisun BayPittsburg, CaliforniaAntioch, CaliforniaOakley, CaliforniaBrentwood, CaliforniaDiscovery Bay, CaliforniaRichmond, CaliforniaWikipedia:Citation NeededWikipedia:Citation NeededWikipedia:Citation NeededSan Ramon, CaliforniaAlameda County, CaliforniaDublin, CaliforniaPleasanton, CaliforniaWikipedia:Citation NeededWikipedia:Citation NeededMartinez, CaliforniaWalnut Creek, CaliforniaWikipedia:Citation NeededConcord Naval Weapons StationWikipedia:Citation NeededUrban Open SpaceContra Costa County LibraryContra Costa TimesMedia News GroupWalnut Creek, CaliforniaDean LesherClayton, CaliforniaMartinez, CaliforniaHayDraft AnimalOrinda, CaliforniaLafayette, CaliforniaWalnut Creek, CaliforniaDanville, CaliforniaCaldecott TunnelInterstate 80 In 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