Petersburg city, Illinois
Official LSAD Designation: Petersburg city • Census GEOID: 1759312
• Menard County
Demographics & Population Profile
Population and demographics for Petersburg city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 2,125 | — | 2025 | Census |
| Median Age | 38.7 yrs | ±4 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 1,150 | ±140 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).