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 Pennsylvania. 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 (Charleroi, Pennsylvania), now John K. Tener LibraryCharleroi1909–1912James Knox TaylorUnited States Post Office (Connellsville, Pennsylvania)Connellsville1913James Knox Taylor ()Erie Federal Courthouse and Post OfficeErie1937R. Stanley-Brown, Louis A. SimonUnited States Post Office (Hanover, Pennsylvania)Hanover1911–1913James Knox TaylorUnited States Post Office (Lancaster, Pennsylvania)Lancaster1928–1930James A. Wetmore ()United States Post Office (Oil City, Pennsylvania)Oil City1906James Knox TaylorUnited States Post Office-Main Branch (Philadelphia)Philadelphia1931–1935Rankin & KelloggUnited States Post Office and Federal Building Philadelphia1873–1884United States Court House and Post Office Building, now the Nix Federal BuildingPhiladelphia1937Harry Sternfeld, Ballinger CompanyB. Free Franklin Post OfficePhiladelphiaAllegheny Post Office, now Children's Museum of PittsburghPittsburgh1893–1897Frank E. Rutan, Jeremiah O'Rourke, William M. Aiken ()United States Post Office and Courthouse-Pittsburgh, now Joseph F. Weis, Jr. U.S. CourthousePittsburgh1931–1934Trowbridge & Livingston, Shalom Baranes Associates, James A. WetmoreUnited States Post Office (Punxsutawney, Pennsylvania)Punxsutawney1912–1914James Knox Taylor ()United States Post Office and Court House, now William J. Nealon Federal Building and United States CourthouseScranton1931Louis A. Simon, James A. WetmoreUnited States Post Office-Sewickley Branch, now Sewickley Valley Cultural Center Sewickley1911James Knox Taylor ()United States Post Office (West Chester, Pennsylvania)West Chester1907James Knox TaylorUnited States Post Office, now City Hall (Williamsport, Pennsylvania)Williamsport1888–1891William Alfred Freret ()

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