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	59338	Kinsey	Custer County	`406`
MT	59339	Lindsay	Dawson County	`406`
MT	59341	Mildred	Prairie County	`406`
MT	59343	Olive	Powder River County	`406`
MT	59344	Plevna	Fallon County	`406`
MT	59345	Powderville	Custer County	`406`
MT	59347	Rosebud	Rosebud County	`406`
MT	59349	Terry	Prairie County	`406`
MT	59351	Volborg	Powder River County	`406`
MT	59353	Wibaux	Wibaux County	`306, 406, 474, 701`

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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.