O'Fallon Township, St. Clair County, Illinois
| O'Fallon Township | |
|---|---|
| Township | |
 Location in St. Clair County |
|
 St. Clair County's location in Illinois |
|
| Country | United States |
| State | Illinois |
| County | St. Clair |
| Established | November 6, 1883 |
| Area | |
| • Total | 35.78 sq mi (92.7 km2) |
| • Land | 35.12 sq mi (91.0 km2) |
| • Water | 0.66 sq mi (1.7 km2) 1.84% |
| Population (2010) | |
| • Total | 26,053 |
| • Density | 741.9/sq mi (286.4/km2) |
| Time zone | CST (UTC-6) |
| • Summer (DST) | CDT (UTC-5) |
O'Fallon Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 26,053 and it contained 10,338 housing units.
According to the 2010 census, the township has a total area of 35.78 square miles (92.7 km2), of which 35.12 square miles (91.0 km2) (or 98.16%) is land and 0.66 square miles (1.7 km2) (or 1.84%) is water.
Coordinates: 38°36′49″N 89°51′53″W / 38.61361°N 89.86472°W
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