16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 56721 | East Grand Forks | 10,679 |
| 56716 | Crookston | 8,903 |
| 56542 | Fosston | 2,486 |
| 56762 | Warren | 2,433 |
| 56540 | Fertile | 1,891 |
| 56556 | Mcintosh | 1,312 |
| 56535 | Erskine | 1,307 |
| 56723 | Fisher | 838 |
| 56736 | Mentor | 687 |
| 56592 | Winger | 550 |
| 56523 | Climax | 382 |
| 56722 | Euclid | 377 |
| 56684 | Trail | 280 |
| 56646 | Gully | 266 |
| 56517 | Beltrami | 255 |
| 56568 | Nielsville | 140 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Polk County, Minnesota (US Census).