| Zip Code : | 62269 |
| City : | O'Fallon city, Shiloh village, Swansea village |
| County : | St. Clair County |
| State : | Illinois (IL) |
| | |
| Land Area : | 27.02 sq mi |
| Water Area : | 0.29 sq mi |
| Latitude : | 38.6000689 |
| Longitude : | -89.9154791 |
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| Population (2010): | 31,348 |
| Population Estimate (2012) : | 31,441 |
| Population Density : | 1,160.01/sq mi |
| Housing Units (2012) : | 12,753 |
| Median Household Income (2012) : | $77,963 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $91,282 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $195,700 (Illinois : $190,800, USA : $181,400) |