California County Maps
Find California county and township maps.
San Mateo County, California
Find your California County by searching for your address, or by clicking on the map.
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
An interactive map of Counties in California. Click on a County to view more information about that County.
About San Mateo County, California
San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, and the third most populated city following Daly City and San Mateo. San Mateo County is included in the San Francisco–Oakland–Berkeley, CA MSA, Silicon Valley, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay. It covers most of the San Francisco Peninsula. San Francisco International Airport is located in the northeastern area of the county and is approximately 7 miles (11 km) south of the city and county limits of San Francisco, even though the airport itself is assigned a San Francisco postal address. The county's built-up areas are mostly suburban, and are home to many corporate campuses.
What is this?
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.