San Mateo County Sheriff Badge

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, the third-most populated city in the county after Daly City and San Mateo.
  • Country: United States
  • State: California
  • Incorporated: April 19, 1856
  • Named for: Saint Matthew (English translation)
  • Largest city by population: San Mateo
  • Highest elevation: 2,603 ft (793 m)
  • Area codes: 415/628, 650

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Data from: en.wikipedia.org