United States post offices operate under the authority of the United States Post Office Department (1792–1971) or the United States Postal Service (since 1971). Historically, post offices were usually placed in a prominent location. Many were architecturally distinctive, including notable buildings featuring Beaux-Arts, Art Deco, and Vernacular architecture. However, modern U.S. post offices were generally designed for functionality rather than architectural style.

Following is a list of United States post offices in Montana. Notable post offices include individual buildings, whether still in service or not, which have architectural, historical, or community-related significance. Many of these are listed on the National Register of Historic Places (NRHP) or state and local historic registers.

Post officeCityDate builtImageArchitectNotesU.S. Post Office-Anaconda MainAnaconda1932–1933James A. WetmoreUnited States Post Office and Courthouse–BillingsBillings1914Oscar Wenderoth with U.S. Post Office (Butte, Montana), now Mike Mansfield Federal Building and United States CourthouseButte1904, 1932James Knox Taylor, James Wetmore With .U.S. Post Office-Dillon MainDillon1935–1936Louis A. SimonUnited States Post Office and Courthouse–Glasgow MainGlasgow1939Louis A. Simon with United States Post Office (Glendive, Montana)Glendive1935 Louis A. SimonUnited States Post Office and Courthouse–Great FallsGreat Falls1912James Knox Taylor with United States Post Office and Courthouse–Havre MainHavre1932James A. Wetmore with United States Post Office and Federal Building-LewistownLewistown1931James A. WetmoreUnited States Post Office-Livingston MainLivingston1913–1914Oscar WenderothMiles City Main Post OfficeMiles City1916Oscar WenderothUnited States Post Office (Missoula, Montana)Missoula1911–1913James Knox Taylor

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