O'Fallon city, Missouri
Official LSAD Designation: O'Fallon city • Census GEOID: 2954074
• St. Charles County
O'Fallon city is an incorporated city in St. Charles County, Missouri. According to official records from the Census (2025), O'Fallon city had an estimated population of 96,101 residents. Official Census Bureau geographic records classify this community under LSAD designation O'Fallon city (GEOID 2954074).
Local Government Administration U.S. Census Bureau GMAF
City Of O'fallon
Municipal
Official Title:
Communications Director
Address:
100 N MAIN ST, O FALLON MO 63366-2200
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 | 96,101 | 2025 |
| Median Household Income | $110,443 | 2020-2024 |
| Median Home Value | $326,200 | 2020-2024 |
| Land Area | 30.99 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).