| Post Office | Wahpeton |
| Division | Richland |
| Pincode | 58075 |
| Post Office | Hankinson |
| Division | Richland |
| Pincode | 58041 |
| Post Office | Lidgerwood |
| Division | Richland |
| Pincode | 58053 |
| Post Office | Wyndmere |
| Division | Richland |
| Pincode | 58081 |
| Post Office | Walcott |
| Division | Richland |
| Pincode | 58077 |
| Post Office | Fairmount |
| Division | Richland |
| Pincode | 58030 |