| Locality | Postal Code |
|---|---|
| Almora, Otter Tail | 56551 |
| Amor, Otter Tail | 56515 |
| Basswood, Otter Tail | 56576 |
| Battle Lake, Otter Tail | 56515 |
| Bluffton, Otter Tail | 56518 |
| Butler, Otter Tail | 56567 |
| Carlisle, Otter Tail | 56537 |
| Clitherall, Otter Tail | 56524 |
| Cormorant, Otter Tail | 56572 |
| Dalton, Otter Tail | 56324 |
| Deer Creek, Otter Tail | 56527 |
| Dent, Otter Tail | 56528 |
| Elizabeth, Otter Tail | 56533 |
| Erhard, Otter Tail | 56534 |
| Fergus Falls, Otter Tail | 56537 |
| Henning, Otter Tail | 56551 |
| Maine, Otter Tail | 56586 |
| New York Mills, Otter Tail | 56567 |
| Ottertail, Otter Tail | 56571 |
| Parkers Prairie, Otter Tail | 56361 |
| Pelican Rapids, Otter Tail | 56572 |
| Perham, Otter Tail | 56573 |
| Richville, Otter Tail | 56576 |
| Underwood, Otter Tail | 56586 |
| Vergas, Otter Tail | 56587 |
| Vining, Otter Tail | 56588 |