| Post Office | East Grand Forks |
| Division | Polk |
| Pincode | 56721 |
| Post Office | Crookston |
| Division | Polk |
| Pincode | 56716 |
| Post Office | Fosston |
| Division | Polk |
| Pincode | 56542 |
| Post Office | Fertile |
| Division | Polk |
| Pincode | 56540 |
| Post Office | Erskine |
| Division | Polk |
| Pincode | 56535 |
| Post Office | Mcintosh |
| Division | Polk |
| Pincode | 56556 |