San Mateo County, California
San Mateo County is a county in California. Its county FIPS code is 06081. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 06081
- Representative coordinates
- 37.414672, -122.371546
- County type
- County
- County seat or government
- Redwood City
- Resident population, July 2025
- 743,568
- Land area
- 1,161.876 km²
- Water area
- 757.209 km²
- State
- California
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in San Mateo County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Los_Angeles | UTC-08:00 in January; UTC-07:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
94002 · 94005 · 94010 · 94014 · 94015 · 94018 · 94019 · 94020 · 94021 · 94025 · 94027 · 94028 · 94030 · 94037 · 94038 · 94044 · 94060 · 94061 · 94062 · 94063 · 94065 · 94066 · 94070 · 94074 · 94080 · 94112 · 94128 · 94134 · 94303 · 94401 · 94402 · 94403 · 94404
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details 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.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Atherton town, CA
- Baywood Park CDP, CA
- Belmont city, CA
- Brisbane city, CA
- Broadmoor CDP, CA
- Burlingame city, CA
- Colma town, CA
- Daly City city, CA
- East Palo Alto city, CA
- El Granada CDP, CA
- Emerald Lake Hills CDP, CA
- Foster City city, CA
- Half Moon Bay city, CA
- Highlands CDP, CA
- Hillsborough town, CA
- Ladera CDP, CA
- La Honda CDP, CA
- Loma Mar CDP, CA
- Menlo Park city, CA
- Millbrae city, CA
- Montara CDP, CA
- Moss Beach CDP, CA
- North Fair Oaks CDP, CA
- Pacifica city, CA
- Pescadero CDP, CA
- Portola Valley town, CA
- Redwood City city, CA
- San Bruno city, CA
- San Carlos city, CA
- San Mateo city, CA
Browse all cities, towns and communities for San Mateo County
Areas sharing the mapped boundary
These areas touch this mapped boundary.
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 at your current point, check its ZIP area, or find its physical time zone.
Small boundary contacts to check
These maps have small contacts that do not confidently establish another jurisdiction or clock zone. They remain separate from the main answer. Check a precise address near the line with the responsible authority.