Lake St. Louis city, Missouri
Official LSAD Designation: Lake St. Louis city • Census GEOID: 2940043
• St. Charles County
Demographics & Population Profile
Population and demographics for Lake St. Louis city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 19,129 | — | 2025 | Census |
| Median Age | 42.7 yrs | ±2.7 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 7,351 | ±317 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).