| 1 | Maryville village (northeast) | 11,276 |
| 2 | Glen Carbon village (southwest) | 8,923 |
| 3 | Godfrey village (north-northwest) | 8,014 |
| 4 | Troy city (north) | 7,737 |
| 5 | Marine village (west) | 7,398 |
| 6 | Marine village (east) | 6,853 |
| 7 | Glen Carbon village (north) | 6,766 |
| 8 | Godfrey village (northeast) | 6,572 |
| 9 | Rosewood Heights CDP (northwest) | 6,220 |
| 10 | St. Jacob village (south) | 6,213 |
| 11 | Glen Carbon village (southeast) | 6,159 |
| 12 | Pontoon Beach village (north-northwest) | 6,110 |
| 13 | St. Jacob village (west-southwest) | 6,101 |
| 14 | Troy city (south) | 5,791 |
| 15 | Edwardsville city (west-southwest) | 5,786 |
| 16 | Holiday Shores CDP (north) | 5,566 |
| 17 | Moro CDP (south-southeast) | 5,534 |
| 18 | Edwardsville city (east-northeast) | 5,410 |
| 19 | Collinsville city (east) | 5,178 |
| 20 | Worden village | 5,075 |
| 21 | South Roxana village (south) | 4,976 |
| 22 | Granite City city (east) | 4,893 |
| 23 | Collinsville city (east-northeast) | 4,875 |
| 24 | Pontoon Beach village (west) | 4,809 |
| 25 | East Alton village (east-northeast) | 4,540 |
| 26 | Alton city (north-northeast) | 4,443 |
| 27 | Alhambra village | 4,422 |
| 28 | Pontoon Beach village (southeast) | 4,305 |
| 29 | Collinsville city (west-northwest) | 4,132 |
| 30 | Maryville village (northwest) | 4,002 |
| 31 | Highland city | 3,844 |
| 32 | Granite City city (north) | 3,665 |
| 33 | Pontoon Beach village (northeast) | 3,615 |
| 34 | Madison city (south-southwest) | 3,574 |
| 35 | Holiday Shores CDP (south) | 3,571 |
| 36 | Moro CDP (northwest) | 3,564 |
| 37 | Wood River city | 3,344 |
| 38 | Godfrey village (south-southeast 1) | 3,165 |
| 39 | Alton city (east-southeast) | 3,078 |
| 40 | Maryville village (south) | 2,999 |
| 41 | Godfrey village (west-southwest) | 2,965 |
| 42 | Bethalto village | 2,796 |
| 43 | Maryville village (southwest) | 2,672 |
| 44 | Madison city (north-northeast) | 2,667 |
| 45 | Collinsville city (southwest) | 2,664 |
| 46 | Alton city (south) | 2,657 |
| 47 | Granite City city (southwest) | 2,603 |
| 48 | East Alton village (northwest) | 2,460 |
| 49 | Moro CDP (southwest) | 2,458 |
| 50 | East Alton village (east-southeast) | 2,398 |
| 51 | South Roxana village (north) | 2,367 |
| 52 | Alton city (west-northwest) | 2,291 |
| 53 | Moro CDP (east-northeast) | 2,239 |
| 54 | Venice city (northeast) | 2,214 |
| 55 | Pontoon Beach village (west-southwest) | 2,140 |
| 56 | East Alton village (southeast) | 2,118 |
| 57 | Godfrey village (south-southeast 2) | 1,900 |
| 58 | Alton city (west-southwest) | 1,871 |
| 59 | St. Jacob village (northeast) | 1,866 |
| 60 | Rosewood Heights CDP (southeast) | 1,750 |
| 61 | Granite City city (south) | 1,720 |
| 62 | Venice city (southwest) | 1,682 |
| 63 | East Alton village (west-northwest) | 1,635 |