Foster City city, California
Official LSAD Designation: Foster City city • Census GEOID: 0625338
• San Mateo County
Demographics & Population Profile
Population and demographics for Foster City city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 32,411 | — | 2025 | Census |
| Median Age | 39.5 yrs | ±1.5 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 12,998 | ±333 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).