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Where am ILOCATED

San Mateo County, California

San Mateo County, California, has 743,568 residents (July 2025 estimate). Its county seat is Redwood City. It uses Pacific Time and covers 449 sq mi (1,162 km²) of land.

Los AngelesSan DiegoSan Jose
San Mateo County in California
Alameda CountySanta Clara CountySan MateoRedwood CitySouth San FranciscoSan Bruno
San Mateo County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
743,568
Land area
449 sq mi (1,162 km²)
County seat or government
Redwood City
Time zone
Pacific TimeUTC-08:00 in January; UTC-07:00 in July
Median household income
$158,855 ± $2,851
Median home value
$1,559,600 ± $16,159
Median rent, with utilities
$2,922 ± $40
Homes lived in by their owners
58.5% ± 0.7 points
County type
County
Metro or micro area
San Francisco-Oakland-Fremont, CA metro areaCentral county
Water area
292 sq mi (757 km²)
State
California
County code (FIPS)
06081
Coordinates (central point)
37.414672, -122.371546
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in San Mateo County

Time zoneLocal time and UTC offsetNext clock change
Pacific TimeAmerica/Los_AngelesUTC-08:00 in January; UTC-07:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 9411279,277 people
  2. 9408064,761 people
  3. 9401564,091 people
  4. 9430346,879 people
  5. 9401445,315 people
  6. 9440343,276 people
  7. 9401043,025 people
  8. 9406642,728 people
  9. 9402540,721 people
  10. 9413438,633 people
  11. 9404437,274 people
  12. 9406137,048 people
All 33
  1. 9440435,881 people
  2. 9440135,295 people
  3. 9406334,433 people
  4. 9407030,447 people
  5. 9400227,534 people
  6. 9406225,759 people
  7. 9440225,475 people
  8. 9403022,689 people
  9. 9401914,419 people
  10. 9406511,673 people
  11. 940277,002 people
  12. 940286,531 people
  13. 940054,692 people
  14. 940183,834 people
  15. 940372,917 people
  16. 940382,683 people
  17. 940201,694 people
  18. 940601,465 people
  19. 94021321 people
  20. 94074126 people
  21. 941280 people

33 ZIP Code areas overlap San Mateo County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

San Mateo County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

School districts in San Mateo County, largest first

  1. Sequoia Union High School District252,907 people
  2. San Mateo Union High School District242,482 people
  3. Jefferson Union High School District140,100 people
  4. San Mateo-Foster City Elementary School District136,418 people
  5. Redwood City Elementary School District98,322 people
  6. Jefferson Elementary School District (San Mateo County)87,467 people
  7. South San Francisco Unified School District78,621 people
  8. Belmont-Redwood Shores Elementary School District43,226 people
  9. San Bruno Park Elementary School District37,188 people
  10. Pacifica School District36,682 people
  11. Ravenswood City Elementary School District35,859 people
  12. Burlingame Elementary School District31,892 people
All 23
  1. San Carlos Elementary School District28,794 people
  2. Menlo Park City Elementary School District25,953 people
  3. Millbrae Elementary School District25,885 people
  4. Cabrillo Unified School District24,610 people
  5. Hillsborough City Elementary School District11,099 people
  6. Las Lomitas Elementary School District11,024 people
  7. Brisbane Elementary School District9,358 people
  8. Bayshore Elementary School District6,593 people
  9. Portola Valley Elementary School District6,563 people
  10. La Honda-Pescadero Unified School District3,620 people
  11. Woodside Elementary School District3,166 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. San Mateo, California (city)103,105 people
  2. Daly City, California (city)101,964 people
  3. Redwood City, California (city)82,447 people
  4. South San Francisco, California (city)64,305 people
  5. San Bruno, California (city)42,307 people
  6. Pacifica, California (city)37,261 people
  7. Foster City, California (city)32,792 people
  8. Menlo Park, California (city)32,727 people
  9. Burlingame, California (city)30,525 people
  10. San Carlos, California (city)29,614 people
  11. East Palo Alto, California (city)29,069 people
  12. Belmont, California (city)27,337 people
All 33
  1. Millbrae, California (city)22,689 people
  2. North Fair Oaks, California (CDP)13,100 people
  3. Half Moon Bay, California (city)11,391 people
  4. Hillsborough, California (town)11,099 people
  5. Atherton, California (town)6,993 people
  6. El Granada, California (CDP)5,232 people
  7. Woodside, California (town)5,126 people
  8. Brisbane, California (city)4,692 people
  9. Broadmoor, California (CDP)4,586 people
  10. Portola Valley, California (town)4,305 people
  11. Emerald Lake Hills, California (CDP)4,235 people
  12. West Menlo Park, California (CDP)3,634 people
  13. Montara, California (CDP)2,917 people
  14. Moss Beach, California (CDP)2,683 people
  15. Highlands, California (CDP)2,450 people
  16. Colma, California (town)1,636 people
  17. Baywood Park, California (CDP)1,580 people
  18. Ladera, California (CDP)1,297 people

See all 33 cities, towns and communities in San Mateo County, largest first

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Alameda County, California30 mi northeast
  2. Santa Cruz County, California34 mi southeast
  3. Santa Clara County, California40 mi east
  4. San Francisco County, California42 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.