Fitchburg city, Massachusetts
Official LSAD Designation: Fitchburg city • Census GEOID: 2523875
• Worcester County
Demographics & Population Profile
Population and demographics for Fitchburg city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 42,136 | — | 2025 | Census |
| Median Age | 36.3 yrs | ±2 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 16,659 | ±616 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).