Fairfield city, California
Official LSAD Designation: Fairfield city • Census GEOID: 0623182
• Solano County
Demographics & Population Profile
Population and demographics for Fairfield city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 122,489 | — | 2025 | Census |
| Median Age | 36.9 yrs | ±0.6 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 38,757 | ±736 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).