| Locality | Post Code |
|---|---|
| Dickens, Clay | 51333 |
| Everly, Clay | 51338 |
| Fostoria, Clay | 51340 |
| Gillett Grove, Clay | 51341 |
| Greenville, Clay | 51343 |
| Linn Grove, Clay | 51033 |
| Peterson, Clay | 51047 |
| Rossie, Clay | 51357 |
| Royal, Clay | 51357 |
| Ruthven, Clay | 51358 |
| Sioux Rapids, Clay | 50585 |
| Spencer, Clay | 51301 |
| Webb, Clay | 51366 |