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U.S. ZIP Codes Database 2026

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Koochiching County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Koochiching County.

County State ZIP Code City Area Codes
Koochiching County MN 55772 Nett Lake 218
Koochiching County MN 56627 Big Falls 218
Koochiching County MN 56629 Birchdale 218, 807
Koochiching County MN 56649 International Falls 218, 807
Koochiching County MN 56653 Littlefork 218
Koochiching County MN 56654 Loman 218, 807
Koochiching County MN 56658 Margie 218
Koochiching County MN 56660 Mizpah 218
Koochiching County MN 56661 Northome 218
Koochiching County MN 56668 Ranier 218, 807
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.