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California Counties The U.S. state of California is divided into fifty-eight counties.
On January 4, 1850, the California constitutional committee recommended the formation of 18 counties. They were
Benicia, Butte, Fremont, Los Angeles, Mariposa, Monterey, Mount Diablo, Oro, Redding, Sacramento, San Diego, San
Francisco, San Joaquin, San Jose, San Luis Obispo, Santa Barbara, Sonoma, and Sutter. On April 22, the Counties of Branciforte, Calaveras, Coloma, Colusi, Marin, Mendocino, Napa, Trinity, and Yuba were added. Benicia was
renamed Solano, Coloma to El Dorado, Fremont to Yola, Mt. Diablo to Contra Costa, San Jose to Santa Clara, Oro
to Tuolumne, and Redding to Shasta. One of the first state legislative acts regarding Counties was to rename
Branciforte County to Santa Cruz, Colusi to Colusa, and Yola to Yolo.
The last California county to have been established is Imperial County in 1907.
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Contra Costa County, California
Contra Costa County Education, Geography, and History
Contra Costa County is a county located in the state of California. As of the 2010 census, the population was 1,049,025. The county
seat is Martinez. The name is Spanish for "opposite coast".
Contra Costa County is included in the San Francisco-Oakland-Hayward, CA Metropolitan Statistical Area. It occupies the northern portion of
the East Bay region and is primarily suburban.
Etymology - Origin of Contra Costa County Name
The name signifies "opposite coast," because of its situation
opposite San Francisco, in an easterly direction, on San Francisco Bay. In 1853,
Alameda County was formed from territory originally included in this county.
County QuickFacts: Census Bureau Quick
The County of Contra Costa, California (the "County") was incorporated in 1850 as one of the original 27 counties of
the State of California (the "State"), with the City of Martinez as the County Seat. It is one of the nine counties in
the San Francisco-Oakland Bay Area. The County is the ninth most populous county in California, with its population
reaching approximately 1,051,677 as of January 1, 2008.
According to the US Census Bureau, the county has a total area of 802 square miles (2,078 km2), of
which, 720 square miles (1,865 km2) of it is land and 82 square miles (213 km2) of it (10.25%) is water.
- North: Solano County
- Northeast: Sacramento County
- East: San Joaquin County
- South: Alameda County
- West: San Francisco Bay; Marin County
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