Rock Falls city, Illinois
Official LSAD Designation: Rock Falls city • Census GEOID: 1764928
• Whiteside County
Demographics & Population Profile
Population and demographics for Rock Falls city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 8,521 | — | 2025 | Census |
| Median Age | 37.7 yrs | ±3.8 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 3,797 | ±270 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).