Swansea village, Illinois
Official LSAD Designation: Swansea village • Census GEOID: 1774119
• St. Clair County
Demographics & Population Profile
Population and demographics for Swansea village.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 14,356 | — | 2025 | Census |
| Median Age | 42.3 yrs | ±2.6 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 5,777 | ±375 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).