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San Mateo County, California
San Mateo County runs down the peninsula from Daly City through the Silicon Valley job centers at Redwood City and Menlo Park to the rural Coastside at Half Moon Bay. Employment growth has far outpaced housing for two decades, and the county's development capacity is limited by the Midpeninsula open-space greenbelt, coastal-zone rules on the western slope, and SFO's noise and height constraints.
Open the live San Mateo County map →
San Mateo County at a glance
- 743,000Population (2024)
- Redwood CityCounty seat
- 449 sq miLand area
- 1,655 / sq miDensity
- $156,000Median household income
- $1,495,000Median home value
What the live San Mateo County map shows
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- City Boundaries: 20
- School Boundaries: 23
- Congressional Districts: 2
- Soils: 302
- State House Districts: 3
- State Senate Districts: 2
- Voter Precincts: 338
- Wetlands: 7
- Development News: 2
Cities and towns in San Mateo County
Atherton, Belmont, Brisbane, Burlingame, Colma, Daly City, East Palo Alto, Foster City, Half Moon Bay, Hillsborough, Menlo Park, Millbrae, Pacifica, Portola Valley, Redwood City, San Bruno, San Carlos, San Mateo, South San Francisco, Woodside.
Neighboring counties
- San Francisco County, CA · map
- Alameda County, CA · map
- Santa Cruz County, CA · map
- Santa Clara County, CA · map