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Contra Costa County, California website does offer an opportunity to search for county jobs. Try Employment and Human Services of Contra Costa County.
According to fedstats.gov, the estimated population for Contra Costa County, California, is 1,024,319.
The web address of the Contra Costa County Historical Society is: www.cocohistory.com
Martinez is the County Seat of Contra Costa County.
The address of the Contra Costa County Historical Society is: 610 Main St, Martinez, CA 94553