| Zip Code | City | Population ↓ |
|---|---|---|
| 56537 | Fergus Falls | 19,870 |
| 56573 | Perham | 6,733 |
| 56572 | Pelican Rapids | 5,854 |
| 56567 | New York Mills | 3,163 |
| 56515 | Battle Lake | 2,799 |
| 56361 | Parkers Prairie | 2,650 |
| 56551 | Henning | 2,191 |
| 56586 | Underwood | 1,808 |
| 56528 | Dent | 1,721 |
| 56571 | Ottertail | 1,716 |
| 56534 | Erhard | 1,284 |
| 56587 | Vergas | 1,203 |
| 56324 | Dalton | 1,072 |
| 56527 | Deer Creek | 895 |
| 56576 | Richville | 860 |
| 56453 | Hewitt | 818 |
| 56524 | Clitherall | 706 |
| 56588 | Vining | 461 |
| 56518 | Bluffton | 402 |
| 56533 | Elizabeth | 282 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Otter Tail County, Minnesota (US Census).