| 1 | Dunlap village | 9,556 |
| 2 | Peoria city (north 2) | 8,464 |
| 3 | Peoria city (west-northwest) | 7,168 |
| 4 | Chillicothe city | 5,568 |
| 5 | Peoria city (northwest 2) | 5,002 |
| 6 | Bartonville village (southeast) | 4,972 |
| 7 | Peoria city (north-northwest 2) | 4,962 |
| 8 | Lake Camelot CDP | 4,787 |
| 9 | Bellevue village | 4,729 |
| 10 | Bartonville village (west) | 4,705 |
| 11 | Peoria city (north 4) | 4,680 |
| 12 | Peoria city (east-northeast) | 4,577 |
| 13 | West Peoria city | 4,560 |
| 14 | Trivoli CDP | 4,418 |
| 15 | Peoria city (north-northeast 2) | 4,295 |
| 16 | Bartonville village (northeast) | 4,189 |
| 17 | Peoria city (south-southeast 3) | 3,880 |
| 18 | Peoria city (southeast 1) | 3,875 |
| 19 | Peoria city (east 1) | 3,851 |
| 20 | Peoria city (north-northeast 3) | 3,841 |
| 21 | Peoria Heights village (northeast) | 3,716 |
| 22 | Peoria city (west 1) | 3,687 |
| 23 | Kingston Mines village | 3,568 |
| 24 | Peoria city (east-southeast 2) | 3,558 |
| 25 | Peoria city (southwest) | 3,395 |
| 26 | Princeville village | 3,324 |
| 27 | Peoria city (northwest 1) | 3,300 |
| 28 | Peoria city (southeast 3) | 3,298 |
| 29 | Peoria city (north-northwest 1) | 3,296 |
| 30 | Peoria city (west 2) | 3,229 |
| 31 | Unincorporated | 3,145 |
| 32 | Peoria city (north 1) | 2,990 |
| 33 | Peoria city (north 3) | 2,984 |
| 34 | Peoria city (south 4) | 2,821 |
| 35 | Peoria city (north-northeast 1) | 2,798 |
| 36 | Peoria city (south-southeast 1) | 2,746 |
| 37 | Peoria city (south 2) | 2,690 |
| 38 | Peoria city (south 1) | 2,594 |
| 39 | Rome CDP | 2,549 |
| 40 | Peoria city (southeast 2) | 2,503 |
| 41 | Peoria city (south-southwest 3) | 2,415 |
| 42 | Peoria Heights village (southwest) | 2,068 |
| 43 | Peoria city (south 5) | 1,930 |
| 44 | Peoria city (south-southwest 1) | 1,774 |
| 45 | Peoria city (south 3) | 1,605 |
| 46 | Peoria city (east 2) | 1,583 |
| 47 | Peoria city (south-southwest 2) | 1,572 |
| 48 | Peoria city (east-southeast 1) | 1,419 |
| 49 | Peoria city (south-southeast 2) | 1,195 |