| Zip Code : | 63304 |
| City : | Cottleville city, O'Fallon city, St. Peters city, Weldon Spring city, Weldon Spring Heights town |
| County : | St. Charles County |
| State : | Missouri (MO) |
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| Land Area : | 41.76 sq mi |
| Water Area : | 3.18 sq mi |
| Latitude : | 38.7035082 |
| Longitude : | -90.6675218 |
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| Population (2010): | 40,336 |
| Population Estimate (2012) : | 39,986 |
| Population Density : | 966.00/sq mi |
| Housing Units (2012) : | 14,765 |
| Median Household Income (2012) : | $85,011 (Missouri : $47,333, USA : $53,046) |
| Median Family Income (2012) : | $96,941 (Missouri : $59,395, USA : $64,585) |
| Median House Price (2012) : | $210,700 (Missouri : $138,400, USA : $181,400) |