The exact population of O'Fallon, Illinois as of March 2026 is estimated at 32,289 residents.
Please note: this figure is an estimate and may slightly change as people get born and pass away, it also depends on migration to/from O'Fallon.
Population of O'Fallon, Illinois as of March 2026. How many people live in O'Fallon today?
USA / Illinois / O'FallonCheck out more data on population in Illinois:
- Population of Chicago
- Population of Peoria
- Population of Highland Park
- Population of Orland Park
- Population of Normal
- Population of Elmhurst
- Population of Bartlett
- Population of Quincy
- Population of Carpentersville
- Population of Calumet City
- Population of Niles
- Population of Burbank
- Population of Granite City
- Population of Oak Forest
- Population of Alton
- Population of Homer Glen
- Population of Elmwood Park
This population of O'Fallon IL is provided by US bureau of statistics.
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