| Locality | Post Code |
|---|---|
| Afton, Rock | 53501 |
| Avalon, Rock | 53505 |
| Beloit, Rock | 53511 |
| Clinton, Rock | 53525 |
| Edgerton, Rock | 53534 |
| Evansville, Rock | 53536 |
| Footville, Rock | 53537 |
| Hanover, Rock | 53542 |
| Janesville, Rock | 53545, 53546, 53548 |
| Milton, Rock | 53563 |
| Orfordville, Rock | 53576 |