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 Idaho. 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–Blackfoot MainBlackfoot1936Gilbert Stanley UnderwoodOld Federal Building and US Post OfficeBoise1901William S. Campbell, James L. KnoxBonners Ferry Main Post OfficeBonners Ferry1937–1938Louis A. SimonUnited States Post Office-Buhl MainBuhl1940Louis A. SimonUnited States Post Office (Burley, Idaho)Burley 1935Louis A. Simon, George O. Von NertaU.S. Post Office – Caldwell MainCaldwell1932James A. WetmoreCoeur d'Alene Federal BuildingCoeur d'Alene1928L. L. Welch With .United States Post Office (Grangeville, Idaho)Grangeville1941United States Post Office (Idaho Falls, Idaho)Idaho Falls1916James A. Wetmore, Oscar WenderothUnited States Post Office-Kellogg MainKellogg1937Louis A. SimonMoscow Post Office and Courthouse, now Moscow City HallMoscow1911James Knox TaylorUnited States Post Office-Nampa MainNampa1931James A. WetmoreUnited States Post Office-Orofino MainOrofino1940Louis A. Simon, Neal A. MelickUnited States Post Office-Payette MainPayette1937Louis A. SimonPocatello Post Office, now Pocatello Federal BuildingPocatello1916Frank H. ParadiceUnited States Post Office-Preston MainPreston1940Louis A. Simon, Neal A. MelickUnited States Post Office-St. Anthony MainSt. Anthony1938Louis A. SimonUnited States Post Office-Wallace MainWallace1936Harry B. Carter, Louis A. SimonWeiser Post OfficeWeiser1932Tourtellotte & Hummel With Wickahoney Post Office and Stage StationWickahoney1890sDow Dunning

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