17 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61401 | Galesburg | 30,684 |
| 61448 | Knoxville | 3,906 |
| 61410 | Abingdon | 3,763 |
| 61402 | Galesburg | 1,634 |
| 61467 | Oneida | 1,262 |
| 61488 | Wataga | 1,230 |
| 61428 | Dahinda | 1,153 |
| 61572 | Yates City | 916 |
| 61436 | Gilson | 810 |
| 61489 | Williamsfield | 743 |
| 61414 | Altona | 731 |
| 61430 | East Galesburg | 676 |
| 61458 | Maquon | 632 |
| 61472 | Rio | 430 |
| 61485 | Victoria | 388 |
| 61439 | Henderson | 268 |
| 61474 | Saint Augustine | 238 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 17 ZCTAs in Knox County, Illinois (US Census).