Lake St. Louis city, Missouri
Official LSAD Designation: Lake St. Louis city • Census GEOID: 2940043
• St. Charles County
Lake St. Louis city is an incorporated city in St. Charles County, Missouri. According to official records from the Census (2025), Lake St. Louis city had an estimated population of 19,129 residents. Official Census Bureau geographic records classify this community under LSAD designation Lake St. Louis city (GEOID 2940043).
Local Government Administration U.S. Census Bureau GMAF
City Of Lake Saint Louis
Municipal
Official Title:
City Administrator
Address:
200 CIVIC CENTER DR, LAKE ST LOUIS MO 63367-1307
County Of St Charles
County
Official Title:
County Executive
Address:
100 N 3RD STREET, SUITE 318, SAINT CHARLES MO 63301
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 19,129 | 2025 |
| Median Household Income | $125,693 | 2020-2024 |
| Median Home Value | $405,900 | 2020-2024 |
| Land Area | 8.57 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).