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.

42,735 verified records
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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 59922 Lakeside Flathead County 406
MT 59923 Libby Lincoln County 406
MT 59925 Marion Flathead County 406
MT 59926 Martin City Flathead County 406
MT 59927 Olney Flathead County 406
MT 59928 Polebridge Flathead County 236, 250, 406, 672, 778
MT 59929 Proctor Lake County 406
MT 59930 Rexford Lincoln County 236, 250, 406, 672, 778
MT 59931 Rollins Lake County 406
MT 59932 Somers Flathead 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.