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 Rhode Island. 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 builtImageArchitectNotesBristol Customshouse and Post OfficeBristol1858Ammi B. YoungUnited States Post Office (East Providence, Rhode Island)East Providence1936Louis A. Simon, Neal A. MelickPawtucket Post Office, now Gerald Burns BuildingPawtucket1896William Martin Aiken; James Knox TaylorUnited States Post Office Annex (Providence, Rhode Island), now John O. Pastore Federal Building Providence1938– 1940Louis A. Simon, F. Ellis Jackson, Neal A. MelickApponaug Post Office (Warwick, Rhode Island)Warwick1940Louis A. SimonUnited States Post Office (Westerly, Rhode Island)Westerly1914James Knox TaylorUnited States Post Office (Woonsocket, Rhode Island), now YMCAWoonsocket1910Louis Wetmore; J. K. Taylor

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