There are 16 zip codes in Polk County, Minnesota. The most populated is 56721, located in East Grand Forks. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
56721East Grand Forks10,905
56716Crookston9,048
56542Fosston2,434
56762Warren2,407
56540Fertile1,916
56556Mcintosh1,303
56535Erskine1,242
56723Fisher827
56736Mentor650
56592Winger527
56684Trail400
56523Climax395
56722Euclid357
56646Gully328
56517Beltrami279
56568Nielsville138

Polk County, Minnesota Zip Codes by Population (2024)