Decatur city, Illinois
Official LSAD Designation: Decatur city • Census GEOID: 1718823
• Macon County
Demographics & Population Profile
Population and demographics for Decatur city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 67,884 | — | 2025 | Census |
| Median Age | 39.2 yrs | ±0.9 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 30,920 | ±545 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).