California County Maps
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Contra Costa County, California
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Contra Costa County, California Map
An detailed map of Contra Costa County. Click on a nearby County to view more information about that County.
Map of Counties in California
An interactive map of Counties in California. Click on a County to view more information about that County.
About Contra Costa County, California
Contra Costa County 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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This site has an interactive map of California Counties. Click on the map to find your California county, and view more details. You can also search for your address and use your GPS to find your California County.
Find what County you are in, and see official California County resources and information. Find any county in the United Stated, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.