| 1 | Machesney Park village (north-northeast) | 7,008 |
| 2 | Rockford city (north-northwest 6) | 6,331 |
| 3 | South Beloit city (east) | 6,297 |
| 4 | Winnebago village | 6,017 |
| 5 | Rockton village (east-northeast) | 5,805 |
| 6 | Loves Park city (east) | 5,784 |
| 7 | Roscoe village (east-northeast) | 5,695 |
| 8 | Machesney Park village (northeast) | 5,651 |
| 9 | Rockford city (south 3) | 5,539 |
| 10 | Rockford city (southeast 1) | 5,430 |
| 11 | Rockford city (east-southeast 1) | 5,326 |
| 12 | Rockton village (west-southwest) | 5,231 |
| 13 | Rockford city (east-southeast 2) | 5,180 |
| 14 | Lake Summerset CDP | 5,081 |
| 15 | Pecatonica village | 5,016 |
| 16 | Roscoe village (south-southwest) | 4,868 |
| 17 | Rockford city (north-northwest 2) | 4,852 |
| 18 | Cherry Valley village (south-southwest) | 4,705 |
| 19 | Rockford city (east-northeast 2) | 4,667 |
| 20 | Loves Park city (southeast) | 4,643 |
| 21 | Rockford city (south 1) | 4,637 |
| 22 | Rockford city (east-northeast 1) | 4,598 |
| 23 | Machesney Park village (west-southwest) | 4,452 |
| 24 | Rockford city (north-northeast 1) | 4,242 |
| 25 | Rockford city (east-southeast 3) | 4,123 |
| 26 | Rockford city (east-southeast 4) | 4,073 |
| 27 | Rockford city (east 2) | 4,066 |
| 28 | Rockford city (northwest 2) | 4,062 |
| 29 | Rockford city (south-southeast 1) | 4,031 |
| 30 | Machesney Park village (southwest 1) | 3,944 |
| 31 | Loves Park city (southwest) | 3,910 |
| 32 | Loves Park city (north) | 3,729 |
| 33 | Cherry Valley village (north-northeast) | 3,722 |
| 34 | Rockford city (south-southeast 4) | 3,706 |
| 35 | Rockford city (northeast 3) | 3,696 |
| 36 | Rockford city (south-southeast 3) | 3,671 |
| 37 | Loves Park city (west-southwest) | 3,612 |
| 38 | Rockford city (south-southwest 2) | 3,602 |
| 39 | Rockford city (north-northwest 3) | 3,580 |
| 40 | Rockford city (east-northeast 3) | 3,464 |
| 41 | Rockford city (northwest 1) | 3,424 |
| 42 | Roscoe village (northwest) | 3,421 |
| 43 | Rockford city (east 1) | 3,418 |
| 44 | Rockford city (west-northwest 2) | 3,256 |
| 45 | Rockford city (south 2) | 3,085 |
| 46 | Rockford city (west-southwest 5) | 3,064 |
| 47 | Rockford city (north-northwest 5) | 3,059 |
| 48 | Rockford city (south-southeast 2) | 3,039 |
| 49 | Rockford city (north-northeast 2) | 3,007 |
| 50 | Rockford city (west-northwest 4) | 2,887 |
| 51 | Rockford city (northeast 2) | 2,754 |
| 52 | Loves Park city (west) | 2,739 |
| 53 | Rockford city (northeast 4) | 2,727 |
| 54 | Rockford city (west-northwest 3) | 2,715 |
| 55 | Rockford city (north 2) | 2,701 |
| 56 | Cherry Valley village (northwest) | 2,675 |
| 57 | Rockford city (west 3) | 2,657 |
| 58 | Rockford city (west-southwest 3) | 2,648 |
| 59 | Rockford city (west 2) | 2,605 |
| 60 | Machesney Park village (southwest 2) | 2,569 |
| 61 | Rockford city (south-southwest 5) | 2,557 |
| 62 | Rockford city (north 1) | 2,530 |
| 63 | Rockford city (west-southwest 1) | 2,427 |
| 64 | Rockford city (east-northeast 4) | 2,323 |
| 65 | Rockford city (south-southwest 6) | 2,283 |
| 66 | Rockford city (west-northwest 1) | 2,240 |
| 67 | Rockford city (northeast 1) | 2,216 |
| 68 | South Beloit city (west) | 2,157 |
| 69 | Rockford city (north-northwest 4) | 2,117 |
| 70 | Rockford city (south-southwest 1) | 2,011 |
| 71 | Rockford city (south-southwest 4) | 1,932 |
| 72 | Rockford city (southeast 2) | 1,870 |
| 73 | Rockford city (northwest 3) | 1,788 |
| 74 | Rockford city (north-northwest 1) | 1,641 |
| 75 | Loves Park city (east-northeast) | 1,507 |
| 76 | Rockford city (west 1) | 1,364 |
| 77 | Rockford city (west-southwest 2) | 1,281 |
| 78 | Rockford city (west-southwest 4) | 1,278 |
| 79 | Rockford city (west 4) | 1,267 |
| 80 | Rockford city (south-southwest 3) | 4 |