South San Francisco city, California
Official LSAD Designation: South San Francisco city • Census GEOID: 0673262
• San Mateo County
South San Francisco city is an incorporated city in San Mateo County, California. According to official records from the Census (2025), South San Francisco city had an estimated population of 64,941 residents. Official Census Bureau geographic records classify this community under LSAD designation South San Francisco city (GEOID 0673262).
Local Government Administration U.S. Census Bureau GMAF
City Of South San Francisco
Municipal
Official Title:
Mayor
Address:
400 GRAND AVE, SOUTH SAN FRANCISCO CA 94080-3634
County Of San Mateo
County
Official Title:
Deputy County Manager
Address:
400 COUNTY CTR, REDWOOD CITY CA 94063-1668
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 64,941 | 2025 |
| Median Household Income | $136,578 | 2020-2024 |
| Median Home Value | $1,188,800 | 2020-2024 |
| Land Area | 9.20 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).