Johnston City city, Illinois
Official LSAD Designation: Johnston City city • Census GEOID: 1738544
• Williamson County
Demographics & Population Profile
Population and demographics for Johnston City city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 3,313 | — | 2025 | Census |
| Median Age | 38.3 yrs | ±5.6 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 1,449 | ±169 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).