- Post Office - Osceola IABuilt in 1935.
- Post Office - Oswego KSThe historic post office in Oswego, Kansas was constructed with Treasury Department funds. The building, built in 1939, houses New Deal artwork inside and is still in use today.
- Post Office - Ottawa OHThe historic post office in Ottawa, Ohio was constructed in 1938 with federal Treasury Department funds. The building is still in service.
- Post Office - Oxford NYThe historic post office building in Oxford, New York was "built in 1939-1940, and is one of a number of post offices in New York State designed by the Office of the Supervising Architect of the Treasury Department under Louis A. Simon. It is a one story, five bay, steel frame structure on a raised, poured concrete foundation with a molded brick watercourse. It is square in shape, with a slate covered hipped roof in the Colonial Revival style. The interior features a 1941 mural by Mordi Gassner titled "Family Reunion on Clark Island: Spring 1791." It is located within...
- Post Office - Oxnard CAThe Oxnard Post Office was built by the Treasury Department Bureau of Public Buildings in 1939. It is a two story building in Italian Renaissance Revival style. It is still in active use and the original lobby is intact.
- Post Office - Oyster Bay NYThe historic 1936 post office in Oyster Bay, New York was constructed as a federally sponsored Public Works Administration (PWA) project with Treasury Department funds. A 1933 article in the Suffolk County News described the PWA allotments for this and other nearby post offices: "Actual allotments for post office buildings in Nassau and Suffolk Counties, amounting to $502,430, have been made by the Federal Emergency Administration of Public Works. This sum will provide three new post office buildings in Suffolk and four in Nassau, as follows: Suffolk—Bay Shore, $71,270; East Hampton, $73,400; Riverhead, $81,000. Nassau—Floral Park, $67,760; Garden City, $84,300; Port...
- Post Office - Pacific Grove CAThe historic post office building in Pacific Grove, California was constructed in 1938 with federal Treasury Department funds. The building, which houses a New Deal mural in its lobby, is still in use today. The design is "Monterey style" with tile roof(s) and stucco walls, but the bas-relief columns on the front give a classical touch.
- Post Office - Painted Post NYThe historic post office building in Painted Post, New York "was designed in 1937 and built in 1937-1938 and is one of a number of post offices in New York State designed by the Office of the Supervising Architect of the Treasury Department, Louis A. Simon. It is a one story, three bay structure clad in red brick in the Colonial Revival style. The interior features a 1939 mural by Amy Jones titled 'Recording the Victory' and depicting a Revolutionary War scene."
- Post Office - Palmyra MOThe historic post office in Palmyra, Missouri was constructed with Treasury Department funds in 1940. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Pampa TXThe historic post office in Pampa, Texas was constructed with Treasury Department funds and completed in 1934. The building is still in service.
- Post Office - Paola KSThe historic post office in Paola, Kansas was constructed in 1936 with federal Treasury Department funds. The building is still in service.
- Post Office - Paoli INThe historic post office building in Paoli, Indiana was built in 1938 with New Deal funds. It is still in use today.
- Post Office - Paris ARThe historic post office building in Paris, Arkansas was constructed with federal Treasury Department funds. The building, which was completed in 1939, is still in use today.
- Post Office - Paris MOConstructed by the Treasury Department in 1937.
- Post Office - Park Falls WIConstructed in 1936 and listed on the National Register of Historic Places.
- Post Office - Park Rapids MNThe historic post office in Park Rapids, Minnesota was built in 1938 as a New Deal project. The building bears a standard cornerstone and houses examples of New Deal artwork.
- Post Office - Pasadena TXThis one-story brick building with large porch, supported by six large columns, was constructed in 1939 with Treasury Department funds under the Federal Works Agency. Cornerstone: James A. Farley Postmaster General John M. Carmody Federal Works Administrator W. Englebert Reynolds Supervising Architect Neal A. Melick Supervising Engineer 1939
- Post Office - Pasco WAConstructed by the Treasury Department in 1934.
- Post Office - Paulding OHThe post office in Paulding was completed in 1939 with funds from the federal Treasury Department. It is also the site of Charles Umlauf's "Industry," sculpted for the Treasury Section of Fine Arts in 1940.
- Post Office - Pauls Valley OKThe historic post office in Pauls Valley, Oklahoma was constructed with federal Treasury Department funds. The building was completed in 1936 and is still in use today.
- Post Office - Paulsboro NJThe Paulsboro Post Office was built in 1939 with Treasury Department funds.
- Post Office - Paw Paw MIThe historic post office in Paw Paw, Michigan was constructed in 1939-40 with federal Treasury Department funds. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Pawhuska OKThe historic post office in Pawhuska, Oklahoma was constructed with federal Treasury Department funds. The building, which houses New Deal artwork inside, was completed in 1937 and is still in use today.
- Post Office - Pawnee City NEThe historic post office in Pawnee City, Nebraska was constructed in 1940 with federal Treasury Department funds. The building, which houses New Deal artwork inside, is still in service.
- Post Office - Payette IDThe historic post office in Payette, Idaho was constructed in 1937 with Treasury Department funds. The building is still in service.
- Post Office - Pearl River NYThe historic post office in Pearl River, New York was constructed with federal Treasury Department funds. The building, which was constructed from 1935 to 1936, is still in service.
- Post Office - Pecos TXThe historic U.S. Post Office and Court House in Pecos, Texas bears a 1935 cornerstone and was constructed with federal Treasury Department funds. The building, which was completed in 1936, is still in service as a post office.
- Post Office - Pelham GAThe historic post office in Pelham, Georgia was constructed ca. 1940.
- Post Office - Pella IAThe post office in Pella was completed in 1937 with funds provided by the Treasury Department. It is also the site of Byron Ben Boyd's 1938 mural, "Hollanders Settle in Pella," completed with funds provided by the Treasury Section of Fine Arts and viewable in the lobby. "Over 1,000 residents in the Marion County town of Pella toured the post office on its opening day, April 26, 1937. The Pella Chronicle wrote the $55,000 post office 'fills a long-felt need and it will now be possible to give even better service than before.' The article highlights the spacious lobby, efficient workspace,...
- Post Office - Pendleton INConstructed by the Treasury Department in 1936 under the supervision of Supervising Architect Louis A. Simon and Supervising Engineer Neal A. Melick.
- Post Office - Penns Grove NJThe historic Penns Grove post office was constructed in 1940 with Treasury Department funds.
- Post Office - Perry OKThe historic post office building in Perry, Oklahoma was constructed with federal Treasury Department funds. The building, which was completed in 1939, is still in use today. A New Deal mural that had been housed in the post office lobby has since been relocated to a nearby museum.
- Post Office - Perth Amboy NJThe historic post office in Perth Amboy, New Jersey was constructed with federal Treasury Department funds in 1937. The building is still in use today.
- Post Office - Peterborough NHBuilt in 1936.
- Post Office - Petersburg VAThe historic post office building in Petersburg, Virginia, was constructed by the Treasury Department in 1935. The building is still in use today.
- Post Office - Phillipsburg NJThe historic and distinctive post office building in Phillipsburg, New Jersey was constructed in 1933 with Treasury Department funds. It is still in service.
- Post Office - Picayune MSThe Colonial Revival style post office was built in 1937-8. It contains a mural, "Lumber Region of Mississippi" by Donald H. Robertson.
- Post Office - Piedmont ALThe historic post office in Piedmont, Alabama was constructed in 1940 with federal Treasury Department funds. The building is still in service today.
- Post Office - Piggott ARThe historic post office in Piggott, Arkansas was constructed in 1937-8 with funds provided by the Treasury Department. Louis A. Simon served as the supervising architect and Neal A. Melick was supervising engineer. The building also houses an example of New Deal artwork: a mural entitled "Air Mail," in the lobby. The mural was featured on a sheet of U.S. postage stamps: "Post Office Murals." The First-Day ceremony for the stamps was held in front of the Piggott post office on April 10, 2019.
- Post Office - Pineville KYThe post office in Pineville was completed in 1935 with funds provided by the Treasury Department. It is also the site of Edward Fern's 1942 mural, "Kentucky Mountain Mail En Route," completed with funds provided by the Treasury Section of Fine Arts.