Janesville city, Wisconsin
Official LSAD Designation: Janesville city • Census GEOID: 5537825
• Rock County
Demographics & Population Profile
Population and demographics for Janesville city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 66,929 | — | 2025 | Census |
| Median Age | 40.7 yrs | ±1.2 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 28,326 | ±635 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).