Watertown city, Massachusetts
Official LSAD Designation: Watertown city • Census GEOID: 2573405
• Middlesex County
Demographics & Population Profile
Population and demographics for Watertown city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 35,710 | — | 2025 | Census |
| Median Age | 39.4 yrs | ±1.3 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 16,371 | ±500 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).