California County Maps
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San Mateo County, California
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San Mateo County, California Map
An detailed map of San Mateo County. Click on a nearby County to view more information about that County.
Map of Counties in California
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About San Mateo County, California
San Mateo County, officially the County of San Mateo, is a county in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, the third-most populated city in the county after Daly City and San Mateo.
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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.