Geographic reference
O'Fallon city, Illinois
O'Fallon city is a Census place in Illinois.
Reference details
- State
- Illinois (IL)
- Census GEOID
- 1755249
- Land area
- 41.547 km²
- Water area
- 0.297 km²
- Representative point
- 38.600006, -89.915402
View point on map ↗
Geographic facts: 2026 U.S. Census Gazetteer. Coordinates identify a representative point, not the full geographic boundary.