Contra Costa County

county in California, United States

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Contra Costa County is a county located in California, in the United States. It is one of California's major population centers and serves as an important economic and residential hub in the state.

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Contra Costa County (/ˌkɒntrə ˈkɒstə/ ; Contra Costa, Spanish for 'Opposite Coast') 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 is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.

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