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 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.

Country: United States
State: California
Incorporated: April 19, 1856
Named for: Saint Matthew (English translation)
County seat, and largest city by area: Redwood City
Largest city by population: San Mateo
Type: Council–CEO
Body: Board of Supervisors
President: Dave Pine
Vice President: Warren Slocum
Chief executive officer: Mike Callagy
Population (April 1, 2020): 764,442
Time zone: Pacific Time Zone (UTC-8)
Summer (DST): Pacific Daylight Time (UTC-7)
Area codes: 415/628, 650
FIPS code: 06-081
GNIS feature ID: 277305
Congressional districts: 15th, 16th
Twitter profile: sanmateoco
Instagram profile: sanmateocounty
Facebook profile: CountyofSanMateo
Youtube channel: UC2bWDXcW6FfdxVyR-V34oag
Official Website: http://www.smcgov.org
Wikidata description: county in California, United States
Wikidata id: Q108101
Wikidata label: San Mateo County
Wikidata aliases: Array
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