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69-536: The portion of park area west of Cummings Skyway from its junction with Crockett Boulevard to the southeastern boundary of the park, and from the junction along Crockett Boulevard to the Crockett Ranch Staging Area in the northwestern corner of the park is open to public use. The remainder of the park area is in Land Bank status, and is closed to the public at all times. The southern boundary of

138-655: A character actively sought by some housing purchasers. The downside of this is a corresponding lack of affordable housing for those working 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. Franciscan Assemblage The Franciscan Complex or Franciscan Assemblage

207-424: 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

276-573: A non-Indian population of over 100,000. 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. Contra Costa County

345-512: A once substantial integrated steel plant, 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. The West County

414-600: A shallow-marine setting, with deposition on top of a seamount in the tropical Pacific Ocean and subsequent transport and accretion by the Pacific Plate onto the California continental margin. Thus, even though most of the Franciscan appears to have been deposited in a deep-water setting, it is a complex and diverse assemblage of rocks, and shallow-water settings, though not the norm, existed as well. Although no significant accumulations of oil or gas have been found in

483-482: A sparse, but diverse assemblage of fossils . The most abundant fossils by far are microfossils , particularly in the cherts, which contain single-celled organisms called radiolarians that have exoskeletons of silica . There are also in some of the shales microfossils of planktonic foraminifera that have exoskeletons of carbonate . These microfossils, by and large, indicate deposition in an open-water setting where deep-water conditions exist. Vertebrate fossils in

552-573: Is a county located in the U.S. state of California , in the East Bay of the San Francisco Bay Area . As of the 2020 United States Census , the population was 1,165,927. The county seat is Martinez . It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban . The county's name refers to its position on the other side of the bay from San Francisco . Contra Costa County

621-915: Is a geologic term for a late Mesozoic terrane of heterogeneous rocks found throughout the California Coast Ranges , and particularly on the San Francisco Peninsula . It was named by geologist Andrew Lawson , who also named the San Andreas Fault that defines the western extent of the assemblage. The Franciscan Complex is dominated by greywacke sandstones , shales and conglomerates which have experienced low-grade metamorphism .  Other important lithologies include chert , basalt , limestone , serpentinite , and high-pressure, low-temperature metabasites ( blueschists and eclogites ) and meta-limestones. Fossils like radiolaria are found in chert beds of

690-515: Is a 58.3% registration advantage with 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%). The following table includes the number of incidents reported and the rate per 1,000 persons for each type of offense. The great rancheros of the Spanish period were divided and sold for agricultural uses, with intensively irrigated farming made possible in some areas by

759-425: Is also popular, Tables are available in the park, but they are not reservable (first come, first served). There are no campgrounds. There is a mountain biking loop including narrow multi-use trails with some sections of trail purpose-built for mountain biking including Sugar City, Tree Frog, and Warep trails. Dogs are welcome. They must be on leash in parking lots and staging areas. Dogs may be off leash elsewhere in

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828-475: Is in the cities of Richmond , where there is a 60.3% registration advantage with 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 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

897-629: Is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area . 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

966-627: Is land and 88 square miles (230 km ) (11%) is water. 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

1035-430: 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

1104-446: Is now an extensive public trail system along these canals. 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

1173-416: 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 —

1242-536: The Bay Area Rapid Transit (BART) system, 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 Valley area, with cities such as Walnut Creek and Concord becoming edge cities . The central county cities have in turn spawned their own suburbs within the county, extending east along

1311-466: 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. Contra Costa County is broadly divided into three sub-areas: The most notable natural landmark in

1380-533: The Farallon tectonic plate beneath continental crust of the North American Plate . As oceanic crust descended beneath the continent, ocean floor basalt and sediments were subducted and then tectonically underplated to the upper plate. This resulted in widespread deformation with the generation of thrust faults and folding , and caused high pressure-low temperature regional metamorphism. In

1449-645: 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. The smallest unit

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1518-614: The San Ramon Valley . Early contact was fleeting and mostly peaceful, however, in the late 1700s, Spanish cattle were grazed the territory of the Saklan and their neighbors. The Saklans were one of the few groups who mounted resistance against the efforts of the Spanish to convert them to Christianity. Christian natives were sent to the Saklans to convince them to give up their culture and come to Mission San Jose; they were killed by

1587-880: The Sulphur Bank Mine at Clearlake Oaks , and the Knoxville Mine (cf. McLaughlin Mine ) and others at Knoxville. The Franciscan also contains large bodies of limestone pure enough for making cement , and the Permanente Quarry near Cupertino, California is a giant open-pit mine in a body of Franciscan limestone that supplied most of the cement for building the Shasta Dam across the Sacramento River . The Rockaway Quarry in Pacifica

1656-551: 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 strike-slip faults and

1725-606: The Catholic Church (with 204,070 members) and The Baptist General Conference (with 24,803 members). The Rohr Jewish Learning Institute teaches courses in the county. Since 1932, Contra Costa County has been a Democratic stronghold in presidential elections. It temporarily leaned toward the Republican Party in the 1970s and 1980s, with successive presidential wins by Richard Nixon in 1972, Gerald Ford in 1976, and Ronald Reagan in 1980 and 1984. Reagan

1794-879: 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 , part of the East Bay Regional Parks District . 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,

1863-557: The Franciscan Complex. These fossils have been used to provide age constraints on the different terranes that constitute the Franciscan. The mining opportunities within the Franciscan are restricted to deposits of cinnabar and limestone. The outcrops of the formation have a very large range, extending from Douglas County, Oregon to Santa Barbara County, California . Franciscan-like formations may be as far south as Santa Catalina Island . The formation lends its name to

1932-584: The Franciscan are extremely rare, but include three Mesozoic marine reptiles that are shown in the table below. Again, these indicate an open-water, and therefore deep-marine setting. Although rare, a few shallow-marine fossils have been found as well, and include extinct oysters ( Inoceramus ) and clams ( Buchia ). Microfossils in the Calera Limestone member of the Franciscan exposed at the Permanente and Pacifica cement quarries also indicate

2001-571: The Franciscan can be divided into two groups of rocks. Coherent terranes are internally consistent in metamorphic grade and include folded and faulted clastic sediments, cherts and basalts, ranging from sub-metamorphic to prehnite-pumpellyite or low-temperature blueschist ( jadeite -bearing) grades of metamorphism. Mélange terranes are much smaller, found between or within the larger coherent terranes and sometimes contain large blocks of metabasic rocks of higher metamorphic grade ( amphibolite , eclogite , and garnet -blueschist). The mélange zones in

2070-524: The Franciscan usually have a block in matrix appearance with higher grade metamorphic blocks (blueschist, amphibolite, greenschist , eclogite) embedded within the mélange matrix. The matrix material of the mélanges are mudstone or serpentinite. Geologists have argued for either a tectonic or olistostormal origin. In the northern Coast Ranges , the Franciscan has been divided into the Eastern, Central and Coastal Belts based on metamorphic age and grade, with

2139-408: The Franciscan, other opportunities have been exploited over the years. During the 19th century when gold mining was one of the main industries in California, cinnabar associated with serpentine in the Franciscan and Great Valley Group was mined for quicksilver (mercury) needed to process gold ore and gold-bearing gravels. Some of the more important mines were those at New Idria and New Almaden ,

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2208-601: The Miocene, the Farallon-Pacific spreading center reached the Franciscan trench and the relative motion between Pacific-North America caused the initiation of the San Andreas Fault. Transform motion along the San Andreas Fault obscured and displaced the subduction related structures, resulting in overprinting of two generations of structures. The units of the Franciscan complex are aligned parallel to

2277-438: The Saklans who wanted nothing to do with the Spanish way of life. A punitive expedition was sent to the area in 1797 to repress the Saklans, and a battle was fought in modern-day Lafayette. In the early 1800s, many Saklan fled to the mission as a result of societal collapse from disease. By the 1810s the Saklan's tribal range was essentially devoid of inhabitants. Early interaction of these Native Americans with Europeans came with

2346-611: 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. In 1821 Mexico gained independence from Spain. While little changed in ranchero life,

2415-735: The active margin between the North American and Pacific plates . The Franciscan Complex is in contact with the Great Valley Sequence , which was deposited on the Coast Range Ophiolite , along its eastern side. The type area of Franciscan rocks in San Francisco consists of metagraywackes , gray claystone and shale , thin bedded ribbon chert with abundant radiolarians , altered submarine pillow basalts ( greenstone ) and blueschists . Broadly,

2484-409: 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 m ) lot — actually a little less at 10,000 square feet (930 square metres). 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

2553-474: 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

2622-577: 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 could not, and trading ships were taxed. The exclusive land ownership in California by Hispanics in California would soon end. John Marsh , owner of Rancho Los Meganos in Contra Costa County, sent letters to influential people in

2691-409: 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

2760-482: The county is the 3,849-foot (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 park comprised a very small portion of the mountain. In the 1960s, suburban development expanding from

2829-464: 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) varied widely throughout the county. Values of houses in prosperous areas with good schools declined only modestly in value, while houses recently built in outlying suburbs in

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2898-412: The development of canals that brought water from the eastern riverside portions of the county to the central portion. Other areas could use 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

2967-524: The eastern United States extolling the climate, soil, and potential for agriculture in California, with the purpose of encouraging Americans to immigrate to California and lead to its becoming part of the United States. His letters were published in newspapers throughout the East which started the first wagon trains to California. He invited the settlers to stay on his ranch , and Rancho Los Meganos became

3036-467: The eastern part of the county 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. Home values rebounded as the economy recovered from the recession. According to the U.S. Census Bureau , the county has a total area of 804 square miles (2,080 km ), of which 716 square miles (1,850 km )

3105-540: 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 ,

3174-592: The highly urban environments of the near East Bay. 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, Phillips 66 in Rodeo , Shell Oil (now PBF) and Tesoro (now Marathon)- in Martinez), chemical plants ( Dow Chemical ) and

3243-399: 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 . In the 1860 United States Census, Contra Costa County had a population of 4,381. During World War II, Richmond hosted one of the two Bay Area sites of Kaiser Shipyards and wartime pilots were trained at what

3312-628: The name of the mountain, one in 2005 and another in 2011, but these were not successful. 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. There were 255,560 people (24.4%) of Hispanic or Latino ancestry, of any race; 17.1% of Contra Costa County's population

3381-525: The open spaces that stretch to the north. 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 as Monte del Diablo when natives they were pursuing apparently disappeared into

3450-535: The park reaches nearly to California Highway 4, although there is no entrance to the park from that road. The park contains a segment of the Bay Area Ridge Trail. Goldfinch and Kestrel trails are subject to seasonal closure when eagles are nesting. Cattle grazing is used to manage fuel load in the areas south of Cummings Skyway and the areas in land bank. Popular activities include hiking, running, biking, dog walking and horseback riding. Picnicking

3519-442: The park, provided they are under voice control. This Contra Costa County, California –related article is a stub . You can help Misplaced Pages by expanding it . This protected areas-related article is a stub . You can help Misplaced Pages by expanding it . Contra Costa County, California Contra Costa County ( / ˌ k ɒ n t r ə ˈ k ɒ s t ə / ; Contra Costa , Spanish for 'Opposite Coast')

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3588-987: The park. MDSP was the first of twenty-nine Diablo-area parks and preserves that have been created around the peaks; today these preserves protect more than 89,000 acres (360 km ). 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 Preserve . The new Marsh Creek State Park , formerly known as Cowell Ranch State Park, and Black Diamond Mines Regional Preserve , are among

3657-599: The population, while ethnic Asians constituted 13.1%. Latinos, representing people of Spanish, Portuguese, indigenous and mestizo populations of the Western hemisphere, comprised 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

3726-617: The product of undersea volcanic eruptions. The Bay Miwok , Yokut and Ohlone people lived in the area now known as Contra Costa County before the arrival of Spanish colonists. The Volvon triblet of the Miwok lived on Tuyshtak ( Mount Diablo near present day Walnut Creek ) until they were forcibly moved from their land into the Spanish missions in the early 1800s. The Saklan tribe lived between Moraga , along San Leandro Creek , to Lafayette . Beginning in 1772, expeditions of Spanish missionaries and soldiers from Mission San José entered

3795-449: The rocks younging and the metamorphic grade decreasing to the west. The Franciscan varies along strike, because individual accreted elements (packets of trench sediment, seamounts , etc.) did not extend the full length of the trench. Different depths of underplating , distribution of post-metamorphic faulting, and level of erosion produced the present-day surface distribution of high P/T metamorphism. Franciscan sediments contain

3864-411: The surrounding valleys began to threaten the open space of the mountain. In 1971, MDSP consisted of 6,788 acres (27.5 km ). That year, concerned residents formed the non-profit organization Save Mount Diablo to raise funds and awareness to protect more open space. In addition to encouraging acquisition by the state and local authorities, SMD started fundraising and acquiring properties to transfer to

3933-532: The temporal and spatial variation of mechanisms that operated within the subduction zone. Franciscan rocks are thought to have formed prior to the creation of the San Andreas Fault when an ancient deep-sea trench existed along the California continental margin . This trench, the remnants of which are still active in the Cascadia and Cocos subduction zone, resulted from subduction of oceanic crust of

4002-568: The term describing high-pressure regional metamorphic facies , the Franciscan facies series . The Franciscan Complex is an assemblage of metamorphosed and deformed rocks, associated with east-dipping subduction zone at the western coast of North America. Although most of the Franciscan is Early/Late Jurassic through Cretaceous in age (150-66 Ma), some Franciscan rocks are as old as early Jurassic (180-190 Ma) age and as young as Miocene (15 Ma). The different age distribution represents

4071-707: The terminus of the California trail. 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

4140-518: The thicket. Anglo settlers later misunderstood the use of the word 'monte' (which can mean 'mountain', or 'thicket'), and applied the name to 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 as "Mt. Ronald Reagan" or "Mt. Reagan", after the former US president and California governor. Residents have generated multiple petitions to change

4209-481: 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. The Contra Costa Canal ,

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4278-545: Was $ 73,039 (these figures had risen to $ 75,483 and $ 87,435 respectively as of a 2007 estimate). 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). The largest religious bodies were

4347-403: 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: 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

4416-576: 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. 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. The establishment of

4485-693: Was of Mexican ancestry, while 1.9% was of Salvadoran heritage. As of the census of 2000, there were 948,816 people, 344,129 households, and 242,266 families residing in the county. The population density was 1,318 inhabitants per square mile (509/km ). There were 354,577 housing units at an average density of 492 units per square mile (190 units/km ). Of residents who identified with European ethnicities, 9.0% were 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

4554-433: 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

4623-506: Was one square league, or about seven square miles, or 4,400 acres (17.8 square kilometers), maximum to one individual was eleven leagues, or 48,400 acres (195.9 km ), including no more than 4,428 acres (17.9 km ) 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

4692-762: Was the last Republican presidential candidate to win the county. In the United States House of Representatives , Contra Costa County is split among three congressional districts: In the State Assembly , Contra Costa County is split among four districts: In the State Senate , the county is split among three districts: Democrats hold wide advantages in voter registration numbers in all political subdivisions in Contra Costa County. The Democrats' largest registration advantage in Contra Costa

4761-534: Was under U.S. control by January 1847 and formally annexed and paid for by the U.S. in 1848. By 1850, California's population of over 100,000 was rapidly growing due to the gold rush and the large amount of gold being exported east, which 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

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