Colchester city, Illinois
Official LSAD Designation: Colchester city • Census GEOID: 1715378
• McDonough County
Demographics & Population Profile
Population and demographics for Colchester city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 1,070 | — | 2025 | Census |
| Median Age | 41.6 yrs | ±6.1 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 532 | ±101 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).