| Locality | Post Code |
|---|---|
| Abingdon, Knox | 61410 |
| Altona, Knox | 61414 |
| Appleton, Knox | 61428 |
| Columbia Heights, Knox | 61430 |
| Dahinda, Knox | 61428 |
| Delong, Knox | 61436 |
| East Galesburg, Knox | 61430 |
| Galesburg, Knox | 61401 |
| Gilson, Knox | 61436 |
| Henderson, Knox | 61439 |
| Henderson Grove, Knox | 61401 |
| Hermon, Knox | 61458 |
| Knoxville, Knox | 61448 |
| Maquon, Knox | 61458 |
| Oak Run, Knox | 61428 |
| Oneida, Knox | 61467 |
| Rio, Knox | 61472 |
| Saint Augustine, Knox | 61474 |
| Victoria, Knox | 61485 |
| Wataga, Knox | 61488 |
| Williamsfield, Knox | 61489 |
| Yates City, Knox | 61572 |