| Zip Code : | 63301 |
| City : | St. Charles city, St. Peters city, West Alton city |
| County : | St. Charles County |
| State : | Missouri (MO) |
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| Land Area : | 88.38 sq mi |
| Water Area : | 10.02 sq mi |
| Latitude : | 38.8580351 |
| Longitude : | -90.4633160 |
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| Population (2010): | 48,514 |
| Population Estimate (2012) : | 49,478 |
| Population Density : | 548.92/sq mi |
| Housing Units (2012) : | 20,603 |
| Median Household Income (2012) : | $55,966 (Missouri : $47,333, USA : $53,046) |
| Median Family Income (2012) : | $68,811 (Missouri : $59,395, USA : $64,585) |
| Median House Price (2012) : | $165,200 (Missouri : $138,400, USA : $181,400) |