| Zip Code : | 63368 |
| City : | Cottleville city, Dardenne Prairie city, Lake St. Louis city, O'Fallon city, Weldon Spring city |
| County : | St. Charles County |
| State : | Missouri (MO) |
| | |
| Land Area : | 16.49 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 38.7512901 |
| Longitude : | -90.7296262 |
| | |
| Population (2010): | 43,360 |
| Population Estimate (2012) : | 42,201 |
| Population Density : | 2,630.12/sq mi |
| Housing Units (2012) : | 15,431 |
| Median Household Income (2012) : | $83,722 (Missouri : $47,333, USA : $53,046) |
| Median Family Income (2012) : | $99,032 (Missouri : $59,395, USA : $64,585) |
| Median House Price (2012) : | $220,000 (Missouri : $138,400, USA : $181,400) |