Polk County, Minnesota ZIP codes
16 ZIP codes are in Polk County, plus 9 that cross in from neighboring counties. It's part of the Grand Forks, ND-MN metro area.
- ZIP codes
- 16
- Population in these ZIPs
- 32,786
- Avg. median income
- $71,600population-weighted
- Cities & towns
- 16
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Polk County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 56517 | Beltrami | 255 | $92,500 | $167,700 |
| 56523 | Climax | 382 | $56,685 | $205,400 |
| 56535 | Erskine | 1,307 | $65,536 | $306,700 |
| 56540 | Fertile | 1,891 | $83,646 | $242,700 |
| 56542 | Fosston | 2,486 | $59,706 | $225,600 |
| 56556 | Mcintosh | 1,312 | $61,786 | $213,600 |
| 56568 | Nielsville | 140 | $40,000 | $94,000 |
| 56592 | Winger | 550 | $59,167 | $197,300 |
| 56646 | Gully | 266 | $48,750 | $294,200 |
| 56684 | Trail | 280 | $73,750 | $280,200 |
| 56716 | Crookston | 8,903 | $59,744 | $187,000 |
| 56721 | East Grand Forks | 10,679 | $82,525 | $296,900 |
| 56722 | Euclid | 377 | $94,375 | $263,700 |
| 56723 | Fisher | 838 | $106,250 | $281,500 |
| 56736 | Mentor | 687 | $95,000 | $338,300 |
| 56762 | Warren | 2,433 | $62,933 | $190,200 |
ZIP codes partly in Polk County
These ZIP codes are mostly in a neighboring county but cover part of Polk County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 56621 | Bagley | Clearwater County | 4,336 | $63,721 | $243,600 |
| 56644 | Gonvick | Clearwater County | 830 | $56,364 | $213,700 |
| 56651 | Lengby | Mahnomen County | 667 | $80,750 | $222,900 |
| 56701 | Thief River Falls | Pennington County | 12,705 | $78,599 | $188,900 |
| 56710 | Alvarado | Marshall County | 483 | $68,000 | $139,400 |
| 56715 | Brooks | Red Lake County | 329 | $77,875 | $163,200 |
| 56742 | Oklee | Red Lake County | 744 | $92,500 | $183,600 |
| 56744 | Oslo | Marshall County | 571 | $81,750 | $173,800 |
| 56750 | Red Lake Falls | Red Lake County | 2,324 | $71,875 | $217,300 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Polk County
Nearby counties
Frequently asked questions
How many ZIP codes are in Polk County, Minnesota?
16 ZIP codes are mainly in Polk County, and 9 more ZIP codes from neighboring areas reach partly into it.
What cities are in Polk County?
ZIP codes in Polk County use the city names Beltrami, Climax, Crookston, East Grand Forks, Erskine, Euclid, Fertile, Fisher, Fosston, Gully, Mcintosh and Mentor and others.
What metro area is Polk County in?
Polk County is part of the Grand Forks, ND-MN metropolitan statistical area.