San Mateo County, California

county in California, United States

San Mateo County (/ˌsæn məˈt./ SAN mə-TAY-oh; Spanish for "Saint Matthew") is a county in the U.S. state of California. As of the 2020 census, the population was 764,442.[1] The county seat is Redwood City.[2] The county is in the San Francisco Bay Area region. It is on the San Francisco Peninsula.

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