South San Francisco city, California
Official LSAD Designation: South San Francisco city • Census GEOID: 0673262
• San Mateo County
Demographics & Population Profile
Population and demographics for South San Francisco city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 64,941 | — | 2025 | Census |
| Median Age | 43.2 yrs | ±1.4 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 21,838 | ±653 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).