U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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State directory

Montana ZIP Codes

Complete postal directory, details, and geographic map for the State of Montana.

State ZIP Code City County Area Codes
MT 59427 Cut Bank Glacier County 368, 403, 406, 587, 825
MT 59430 Denton Fergus County 406
MT 59432 Dupuyer Pondera County 406
MT 59433 Dutton Teton County 406
MT 59434 East Glacier Park Glacier County 368, 403, 406, 587, 825
MT 59435 Ethridge Toole County 406
MT 59436 Fairfield Teton County 406
MT 59440 Floweree Chouteau County 406
MT 59441 Forest Grove Fergus County 406
MT 59442 Fort Benton Chouteau County 406
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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.