Marseilles city, Illinois
Official LSAD Designation: Marseilles city • Census GEOID: 1747150
• LaSalle County
Demographics & Population Profile
Population and demographics for Marseilles city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 4,809 | — | 2025 | Census |
| Median Age | 41.4 yrs | ±4.9 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 1,845 | ±163 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).