San Mateo County, California

San Mateo County
San Mateo County
County
	County of San Mateo
	Images, from top down, left to right: View of San Francisco Bay from the San Francisco Bay Discovery Site, San Mateo County Government Center, Año Nuevo State Park
	Seal
	Motto: All of California in One County
	Interactive map of San Mateo County
	Location in California
	Coordinates: 37°26′N 122°22′W / 37.44°N 122.36°W
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
Government
• Type	Council–CEO
• Body	Board of Supervisors
• President	Dave Pine
• Vice President	Warren Slocum
• Board of Supervisors	Supervisors Dave Pine; Noelia Corzo; Ray Mueller; Warren Slocum; David J. Canepa;
• Chief executive officer	Mike Callagy
Area
• Total	744 sq mi (1,930 km2)
• Land	448 sq mi (1,160 km2)
• Water	293 sq mi (760 km2)
Highest elevation	2,603 ft (793 m)
Population (April 1, 2020)
• Total	764,442
• Density	1,704/sq mi (658/km2)
Gross Domestic Product
• Total	US$165.414 billion (2022)
Time zone	UTC-8 (Pacific Time Zone)
• Summer (DST)	UTC-7 (Pacific Daylight Time)
Area codes	415/628, 650
FIPS code	06-081
GNIS feature ID	277305
Congressional districts	15th, 16th
Website	www.smcgov.org

San Mateo County (/ˌsæn məˈteɪ.oʊ/ ^ⓘ SAN mə-TAY-oh), 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.^[8] Redwood City is the county seat,^[9] 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 (metropolitan statistical area), 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.