City in Missouri
O'Fallon, MO
- Population
- 95,355 (2024)
- Density
- 3,077 / sq mi
- Land area
- 31.0 sq mi
- Water area
- 0.0 sq mi
- Coordinates
- 38.7788, -90.7218
Resident reviews
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ZIP codes
- 63366
- 63367
- 63368
- 63376