17 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 61401 | Galesburg | 30,580 |
| 61448 | Knoxville | 3,947 |
| 61410 | Abingdon | 3,838 |
| 61402 | Galesburg | 1,623 |
| 61428 | Dahinda | 1,278 |
| 61467 | Oneida | 1,159 |
| 61488 | Wataga | 1,084 |
| 61489 | Williamsfield | 820 |
| 61436 | Gilson | 745 |
| 61572 | Yates City | 732 |
| 61430 | East Galesburg | 713 |
| 61414 | Altona | 696 |
| 61458 | Maquon | 656 |
| 61472 | Rio | 453 |
| 61485 | Victoria | 417 |
| 61439 | Henderson | 299 |
| 61474 | Saint Augustine | 221 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 17 ZCTAs in Knox County, Illinois (US Census).