| City : | Lake St. Louis City |
| County : | St. Charles County |
| State : | Missouri (MO) |
| | |
| Land Area : | 7.91 sq mi |
| Water Area : | 0.81 sq mi |
| Latitude : | 38.7822445 |
| Longitude : | -90.7866051 |
| | |
| Population (2010): | 14,545 |
| Population Estimate (2012) : | 14,390 |
| Population Density : | 1,839.63/sq mi |
| Housing Units (2012) : | 6,197 |
| Median Household Income (2012) : | $77,880 (Missouri : $47,333, USA : $53,046) |
| Median Family Income (2012) : | $96,912 (Missouri : $59,395, USA : $64,585) |
| Median House Price (2012) : | $240,900 (Missouri : $138,400, USA : $181,400) |