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 North Dakota. 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. Some are also included in the multiple-site listing "US Post Offices in North Dakota, 1900--1940 MPS" from 1989.

Post officeCityDate builtImageArchitectNotesUnited States Post Office and Courthouse (Bismarck, North Dakota)Bismarck1912–1913James Knox Taylor with Carrington Post OfficeCarrington1932James A. Wetmore, Redlinger & Hansen and Post Office (Christine, North Dakota)ChristineunknownUnited States Post Office and Courthouse (Devils Lake, North Dakota)Devils Lake1908James Knox Taylor and Dickinson Post OfficeDickinson1916James A. Wetmore With .Federal Building and U.S. Post Office (Fargo, North Dakota)Fargo1916James A. Wetmore Grafton Post Office (Grafton, North Dakota)Grafton1932James Knox Taylor and U.S. Post Office and Courthouse (Grand Forks, North Dakota), now Ronald N. Davies Federal Building and U.S. CourthouseGrand Forks1908–1910James Knox TaylorGrassy Butte Post OfficeGrassy Butte1914Carl Jagol and United States Post Office-HettingerHettinger1937–1938 Louis A. Simon, Neal A. MelickUnited States Post Office-LangdonLangdon1937–1938James A. Wetmore and Lisbon Post OfficeLisbon1939–1940Louis A. Simon and Minot Post Office, now Bruce M. Van Sickle Federal Building and U.S. CourthouseMinot1915Oscar WenderothNew Rockford Post OfficeNew Rockford1938–1939Louis A. Simon and Oakes Post OfficeOakes1934–1935Louis A. SimonUnited States Customs House and Post Office – PembinaPembina1932James A. WetmoreRugby Post OfficeRugby1940Louis A. SimonValley City Post OfficeValley City1916–1917James A. WetmoreWahpeton Post OfficeWahpeton1914Oscar Wenderoth and Old U.S. Post Office (Williston, North Dakota)Williston1915Oscar Wenderoth and

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