Vandalia city, Illinois
Official LSAD Designation: Vandalia city • Census GEOID: 1777317
• Fayette County
Demographics & Population Profile
Population and demographics for Vandalia city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 7,108 | — | 2025 | Census |
| Median Age | 43.9 yrs | ±3.5 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 2,094 | ±166 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).