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Contra Costa County, California
Contra Costa County is located in the state of California in the United States. As of the 2010 census, the population was 1,049,025. The provincial capital is Martínez. It occupies the northern part of the East Bay region of the San Francisco Bay Area and is primarily suburban. The name of the county in Spanish means “opposite coast,” referring to its location on the other side of the San Francisco Bay. Contra Costa County is part of the San Francisco-Oakland-Berkeley, CA Metropolitan Statistical Area.