| Place Name | Lake St. Louis |
| Place Type | City |
| ZIP Code(s) | 63366 63367 63368 63385 |
| County | Saint Charles County |
| Area Code(s) | 636 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 14,390 |
| Population Growth Rate (2010-19) | 14.86% |
| Majority Ethnicity | White 89.87% |
| Metro/Micro Stats Area | St. Louis, MO-IL |
| US Congressional District(s) | Missouri 3rd |
| State House Districts | 107,108 |
| State Senate Districts | 2 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 89.87% |
| African American | 4.31% |
| Hispanic | 0% |
| Asian | 1.42% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.41% |