| 1 | O'Fallon city (west-northwest) | 8,537 |
| 2 | Swansea village (east) | 7,271 |
| 3 | Smithton village (north-northwest) | 7,008 |
| 4 | Scott AFB CDP (southwest) | 6,831 |
| 5 | Swansea village (northeast) | 6,783 |
| 6 | O'Fallon city (south) | 6,657 |
| 7 | Millstadt village (south) | 6,655 |
| 8 | Shiloh village (west-southwest) | 6,120 |
| 9 | Shiloh village (south-southwest) | 5,873 |
| 10 | Caseyville village (east-northeast) | 5,750 |
| 11 | Smithton village (south-southeast) | 5,430 |
| 12 | Shiloh village (northwest) | 5,410 |
| 13 | Fairview Heights city (east) | 5,263 |
| 14 | Millstadt village (west-northwest) | 5,200 |
| 15 | Darmstadt CDP | 5,189 |
| 16 | Sauget village (west-southwest 1) | 5,187 |
| 17 | New Athens village | 5,174 |
| 18 | O'Fallon city (north) | 5,169 |
| 19 | Shiloh village (east-southeast) | 5,027 |
| 20 | Rentchler CDP (north-northwest) | 4,921 |
| 21 | Cahokia Heights city | 4,917 |
| 22 | Lebanon city (north) | 4,561 |
| 23 | Mascoutah city | 4,537 |
| 24 | Lebanon city (south) | 4,423 |
| 25 | East Carondelet village (northwest) | 4,292 |
| 26 | O'Fallon city (east-northeast) | 4,248 |
| 27 | Millstadt village (north) | 4,247 |
| 28 | Belleville city (northwest) | 4,196 |
| 29 | Swansea village (southwest) | 4,184 |
| 30 | Caseyville village (north) | 4,145 |
| 31 | Fairview Heights city (north) | 4,131 |
| 32 | Shiloh village (northeast) | 4,042 |
| 33 | Rentchler CDP (southeast) | 3,951 |
| 34 | Belleville city (southeast) | 3,634 |
| 35 | Belleville city (south-southwest) | 3,633 |
| 36 | Lebanon city (north-northeast) | 3,560 |
| 37 | Belleville city (northeast) | 3,441 |
| 38 | Caseyville village (northeast) | 3,355 |
| 39 | Rentchler CDP (west) | 3,345 |
| 40 | Caseyville village (west) | 3,314 |
| 41 | Rentchler CDP (northwest) | 3,252 |
| 42 | O'Fallon city (southeast) | 3,222 |
| 43 | Sauget village (west-southwest 2) | 3,051 |
| 44 | Millstadt village (north-northeast) | 2,889 |
| 45 | Fairview Heights city (west) | 2,857 |
| 46 | East Carondelet village (southeast) | 2,851 |
| 47 | Freeburg village | 2,738 |
| 48 | Swansea village (west-northwest) | 2,655 |
| 49 | Brooklyn village (south) | 2,488 |
| 50 | Sauget village (east) | 2,370 |
| 51 | Fairmont City village (north) | 2,354 |
| 52 | Brooklyn village (south-southeast) | 2,285 |
| 53 | East St. Louis city (north) | 2,260 |
| 54 | Belleville city (west-northwest) | 2,255 |
| 55 | Belleville city (east) | 2,198 |
| 56 | Washington Park village (west-northwest) | 2,021 |
| 57 | Caseyville village (south-southwest) | 1,857 |
| 58 | Caseyville village (west-southwest) | 1,412 |
| 59 | Fairmont City village (south) | 1,401 |
| 60 | Caseyville village (south) | 1,388 |
| 61 | Brooklyn village (northeast) | 1,244 |
| 62 | Scott AFB CDP (northeast) | 1,144 |
| 63 | Brooklyn village (northwest) | 1,141 |
| 64 | East St. Louis city (west-northwest) | 1,023 |
| 65 | Washington Park village (east-northeast) | 1,003 |
| 66 | Sauget village (north-northeast) | 773 |
| 67 | East St. Louis city (south-southeast) | 604 |
| 68 | Washington Park village (south) | 430 |