| Locality | Post Code |
|---|---|
| Belden, Cedar | 68717 |
| Coleridge, Cedar | 68727 |
| Crofton, Cedar | 68730 |
| Fordyce, Cedar | 68736 |
| Hartington, Cedar | 68739 |
| Laurel, Cedar | 68745 |
| Magnet, Cedar | 68749 |
| Obert, Cedar | 68757 |
| Randolph, Cedar | 68771 |
| Saint Helena, Cedar | 68774 |
| Sholes, Cedar | 68771 |
| South Yankton, Cedar | 68774 |
| Wausa, Cedar | 68786 |
| Wynot, Cedar | 68792 |