List of United States post offices in South Dakota

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 South 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.

Post officeCityDate builtImageArchitectNotesUnited States Post Office and Courthouse–AberdeenAberdeen1936–1938William Dewey FosterUnited States Post Office (Beresford, South Dakota)Beresford1939United States Post Office (Custer, South Dakota)Custer1940Louis A. Simon, Neal A. MelickUnited States Post Office (Flandreau, South Dakota)Flandreau1938United States Post Office (Gregory, South Dakota)Gregory1937United States Post Office Addition (Huron, South Dakota)Huron1911–1914Lemmon Post OfficeLemmon1936–1937Louis A. Simon, Neal A. MelickUnited States Post Office (Mobridge, South Dakota)Mobridge1937–1938Louis A. Simon, Neal A. MelickFederal Building and United States Courthouse (Sioux Falls, South Dakota)Sioux Falls1892–1895,1932Willoughby J. EdbrookeOld Spearfish Post OfficeSpearfish1940Louis A. Simon, Neal A. MelickOld Post Office, now Sturgis Motorcycle MuseumSturgis1937Louis A. Simon, Neal A. MelickMarindahl Post OfficeVolin1870unknown With Old Post Office (Watertown, South Dakota)Watertown1908–1909James Knox TaylorMichelle L. Dennis, "Old Watertown Post Office [Watertown, South Dakota"". SAH Archipedia. Accessed February 20, 2026.United States Post Office (Webster, South Dakota)Webster1937–1938United States Post Office (Yankton, South Dakota)Yankton1905James Knox Taylor

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