Contra Costa County, California

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Contra Costa County ( ; Contra Costa, Spanish for 'Opposite Coast') is a northern county 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–Fremont, CA metropolitan statistical area and the San Jose–San Francisco–Oakland, CA combined statistical area.

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