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 and 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 Colorado. 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 builtImageArchitectNotesAlamosa Post Office Alamosa1935Louis A. SimonBoulder Post OfficeBoulder1910James Knox TaylorCañon City Post Office and Federal BuildingCañon City1931James A. WetmoreUnited States Post Office and Federal Courthouse-Colorado Springs MainColorado Springs1908–1910James Know TaylorDelta Post Office and Federal BuildingDelta1938Louis A. SimonByron White United States CourthouseDenver1910–1916Egerton SwartwoutEnglewood Post OfficeEnglewood1937Louis A. SimonFlorence Post OfficeFlorence1936Louis A. SimonFort Collins Post OfficeFort Collins1911James A. WetmoreUnited States Post Office-Fort Morgan MainFort Morgan1917James A. WetmoreWildhack's Grocery Store-Post OfficeFrisco1883Louis WildhackU.S. Post Office (La Junta, Colorado)La Junta1915Oscar WenderothLas Animas Post OfficeLas Animas1937– 1938Louis A. Simon and United States Post Office-Lamar MainLamar1936Walter DeMordauntUnited States Post Office-Manitou Springs MainManitou Springs1940Louis A. SimonUnited States Post Office and Federal Building-Monte Vista MainMonte Vista1933James A. WetmoreUnited States Post Office-Montrose MainMontrose1931James A. WetmoreFort VasquezPlatteville1835United States Post OfficeRifle1940Louis A. SimonSterling Main Post Office, Federal Building, and Federal CourthouseSterling1930James A. WetmoreUnited States Post Office-Trinidad MainTrinidad1920James Knox TaylorZapata Ranch HeadquartersMoscaunknown

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