San Mateo County Map, California, USA

Written and fact-checked by | Last Updated: December 16, 2025, 14:30 ET

Map of San Mateo County - San Mateo County is a county located in the U.S. state of California. San Mateo County Map showing cities, highways, important places and water bodies. Get Where is San Mateo County located in the map, major cities in San Mateo county, population, areas, and places of interest.

San Mateo County Map, California

Map of San Mateo County, California, United States

About San Mateo County Map, California: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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  • About San Mateo County, California

    San Mateo County is a county located in the San Francisco Bay Area of California, with its county seat in the city of Redwood City. The county has an estimated population of over 770,000 people as of 2021.According to the United States Census Bureau, the county has a total area of 449 sq mi (1,163 km2). San Mateo County was established on 1856.

    San Mateo County is known for its natural beauty, with coastal areas and redwood forests providing opportunities for outdoor recreation. Some of the popular destinations in the county include Half Moon Bay, the Fitzgerald Marine Reserve, and the San Francisco Bay Trail.

    The county is also home to several major technology companies, including Facebook, Oracle, and Genentech. The county's proximity to Silicon Valley has contributed to its strong economy, with technology, healthcare, and education being major industries. San Mateo County is also home to several prestigious universities and colleges, including Stanford University and Notre Dame de Namur University.

    San Mateo County is committed to sustainability and environmental protection, with several initiatives aimed at reducing greenhouse gas emissions and promoting clean energy. The county is also known for its strong community involvement, with residents actively engaged in local politics and social issues.Overall, San Mateo County offers a high quality of life with a mix of urban and natural environments, diverse economic opportunities, and a strong sense of community.

    Facts about San Mateo County, California

    CountryUnited States
    StateCalifornia
    RegionSan Francisco Bay Area (Peninsula)
    County SeatRedwood City
    Named AfterSan Mateo (Saint Matthew)
    Established1856
    Organized1856
    Coordinates37.4339° N, 122.4014° W
    Total Area741 sq mi
    Land Area448 sq mi
    Water Area293 sq mi
    Population (2020)764,442
    Population RankOne of the most populous counties in California
    Major CitiesRedwood City, San Mateo, Daly City, San Bruno
    Main IndustriesTechnology, Biotechnology, Finance, Healthcare
    Major AirportSan Francisco International Airport
    Time ZonePacific Time (UTC−08:00)
    Known ForSilicon Valley (part), Coastal cliffs, San Francisco International Airport, Tech innovation
    Websitehttps://www.smcgov.org

    Ctities and Towns in San Mateo County

    City NameTypePopulation (2020)Pop. DensityAreaIncorporated
    AthertonTown7,1881,431.9/sq mi (552.8/km2)5.02 sq mi (13 km2)September 12, 1923
    BelmontCity28,3356,119.9/sq mi (2,362.9/km2)4.63 sq mi (12 km2)October 29, 1926
    BrisbaneCity4,8511,622.4/sq mi (626.4/km2)2.99 sq mi (7.7 km2)November 27, 1961
    BurlingameCity31,3867,149.4/sq mi (2,760.4/km2)4.39 sq mi (11.4 km2)June 6, 1908
    ColmaTown1,507797.4/sq mi (307.9/km2)1.89 sq mi (4.9 km2)August 5, 1924
    Daly CityCity104,90113,730.5/sq mi (5,301.4/km2)7.64 sq mi (19.8 km2)March 22, 1911
    East Palo AltoCity30,03411,871.1/sq mi (4,583.5/km2)2.53 sq mi (6.6 km2)July 1, 1983
    Foster CityCity33,8058,919.5/sq mi (3,443.8/km2)3.79 sq mi (9.8 km2)April 27, 1971
    Half Moon BayCity11,7951,890.2/sq mi (729.8/km2)6.24 sq mi (16.2 km2)July 15, 1959
    HillsboroughTown11,3871,845.5/sq mi (712.6/km2)6.17 sq mi (16 km2)May 5, 1910
    Menlo ParkCity33,7803,381.4/sq mi (1,305.6/km2)9.99 sq mi (25.9 km2)November 23, 1927
    MillbraeCity23,2167,099.7/sq mi (2,741.2/km2)3.27 sq mi (8.5 km2)January 14, 1948
    PacificaCity38,6403,071.5/sq mi (1,185.9/km2)12.58 sq mi (32.6 km2)November 22, 1957
    Portola ValleyTown4,456490.7/sq mi (189.5/km2)9.08 sq mi (23.5 km2)July 14, 1964
    Redwood CityCity84,2924,358.4/sq mi (1,682.8/km2)19.34 sq mi (50.1 km2)May 11, 1867
    San BrunoCity43,9087,997.8/sq mi (3,088.0/km2)5.49 sq mi (14.2 km2)December 23, 1914
    San CarlosCity30,7225,678.7/sq mi (2,192.6/km2)5.41 sq mi (14 km2)July 8, 1925
    San MateoCity105,6618,702.5/sq mi (3,360.0/km2)12.13 sq mi (31.4 km2)September 4, 1894
    South San FranciscoCity66,1057,185.3/sq mi (2,774.3/km2)9.2 sq mi (23.8 km2)September 19, 1908
    WoodsideTown5,309462.9/sq mi (178.7/km2)11.47 sq mi (29.7 km2)November 16, 1956

    Places to Visit in San Mateo County

    Top places to visit in San Mateo includes Coyote Point Recreation Area, San Mateo Central Park, Seal Point Park, Laurelwood Park, Japanese Garden, Filoli Historic House & Garden.

    Highways in San Mateo County

    Interstate 280, Interstate 380, U.S. Route 101, State Route 1, State Route 9, State Route 35, State Route 82, State Route 84, State Route 92, g State Route 109, State Route 114.

    Nearest Airports

    Nearest airport of San Mateo is San Francisco (SFO) Airport.