File:California county map (Contra Costa County highlighted).svg

DescriptionCalifornia county map (Contra Costa County highlighted).svg A county locator map of California, with Contra Costa County highlighted inred. Date

according to their website. The following counties are highlighted: RED: Alameda, Amador, Butte, Calaveras, Contra Costa, El Dorado, Imperial, Kings, Los Angeles

DescriptionMap of California highlighting Contra Costa County.svg English: This is a locator map showing Contra Costa County in California. For more information

DescriptionContra Costa County California Incorporated and Unincorporated areas Contra Costa Centre Highlighted 0616090.svg Location of Contra Costa Centre

DescriptionContra Costa County California Incorporated and Unincorporated areas Port Costa Highlighted 0658226.svg Location of Port Costa in Contra Costa County