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Contra Costa County, California

Administration
Full nameCounty of Contra Costa
Official nameCounty of Contra Costa
Settlement typeCounty
CountryUnited States
StateCalifornia
Region/Metro areaSan Francisco Bay Area
Incorporated1850
Named for"Opposite coast" ( ) of the San Francisco Bay
Government
County seatMartinez
Geography
Total Area802.15 sq mi (2077.6 km2)
Land Area719.95 sq mi (1864.7 km2)
Water Area82.20 sq mi (212.9 km2)
Demography
Total Population1049025 (2010)
Other information
Time zonePacific Standard Time (UTC-8)
- Summer (DST)Pacific Daylight Time (UTC-7)
Area code510, 925

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Contra Costa County (Spanish for "opposite coast") is a primarily suburban county in the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, it had a population of 1,049,025. The county seat is Martinez.


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