| Locality | Post Code |
|---|---|
| Beltrami, Polk | 56517 |
| Climax, Polk | 56523 |
| Crookston, Polk | 56716 |
| East Grand Forks, Polk | 56721 |
| Eldred, Polk | 56523 |
| Erskine, Polk | 56535 |
| Euclid, Polk | 56722 |
| Fertile, Polk | 56540 |
| Fisher, Polk | 56723 |
| Fosston, Polk | 56542 |
| Gentilly, Polk | 56716 |
| Gully, Polk | 56646 |
| McIntosh, Polk | 56556 |
| Mentor, Polk | 56736 |
| Nielsville, Polk | 56568 |
| Olga, Polk | 56646 |
| Rindal, Polk | 56540 |
| Trail, Polk | 56684 |
| Winger, Polk | 56592 |