Identifiers: city
| Rank | Community | Population |
|---|---|---|
| 1 | O'Fallon (city), MO | 91,316 |
| 2 | St. Charles (city), MO | 70,493 |
| 3 | St. Peters (city), MO | 57,732 |
| 4 | Florissant (city), MO | 52,533 |
| 5 | Chesterfield (city), MO | 49,999 |
| 6 | Wentzville (city), MO | 44,372 |
| 7 | Ballwin (city), MO | 31,103 |
| 8 | Maryland Heights (city), MO | 28,284 |
| 9 | Hazelwood (city), MO | 25,458 |
| 10 | Creve Coeur (city), MO | 18,834 |
| 11 | Ferguson (city), MO | 18,527 |
| 12 | Manchester (city), MO | 18,333 |
| 13 | Lake St. Louis (city), MO | 16,707 |
| 14 | Overland (city), MO | 15,955 |
| 15 | St. Ann (city), MO | 13,019 |
| 16 | Jennings (city), MO | 12,895 |
| 17 | Dardenne Prairie (city), MO | 12,743 |
| 18 | Troy (city), MO | 12,686 |
| 19 | Town and Country (city), MO | 11,640 |
| 20 | Bridgeton (city), MO | 11,445 |