- Post Office - New Rockford NDNew Rockford, North Dakota received a new post office in 1939 with Treasury Department funds. The building, which is listed on the National Register of Historic Places, opened for business on October 29, 1939. Still in use today, the post office houses an example of New Deal artwork.
- Post Office - Newberg ORThe historic post office in Newberg, Oregon was constructed in 1935-6 with federal Treasury Department funds. The building, which houses an example of New Deal artwork inside, is still in operation.
- Post Office - Newcomerstown OHThe historic post office in Newcomerstown, Ohio was constructed in 1939 with federal Treasury Department funds. The building is still in service.
- Post Office - Newport NHThe Newport, New Hampshire post office was constructed in 1934-5 with Treasury Department funds. The stately facility is still in operation.
- Post Office - Newton MSThis New Deal Post Office was constructed in 1936. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Nocona TXThe historic post office in Nocona, Texas was constructed in 1935-6 with federal Treasury Department funds. The building is still in service.
- Post Office - Nokomis ILThe post office in Nokomis was completed in 1941 with funds provided by the Treasury Section of Fine Arts. It is also the site of Bernard J. (Tony) Rosenthal's wood carving, entitled "Coal Mining," completed in 1941 with funds provided by the Treasury Section of Fine Arts and viewable in the lobby.
- Post Office - Normal ILConstructed by the Treasury Department in 1935.
- Post Office - Norristown PAThe historic post office building in Norristown, Pennsylvania was constructed with federal Treasury Department funds in 1934. The building, which houses New Deal murals inside, is still in use today.
- Post Office - North Bergen NJThe North Bergen post office was constructed in 1939 with New Deal funds. A mural by Avery Johnson, “Purchase of Territory of North Bergen from the Indians,” was installed in 1942.
- Post Office - North Hollywood CAIn 1936, the U.S. Department of the Treasury funded the construction of a post office in North Hollywood, CA.
- Post Office - North Manchester INThe historic post office in North Manchester, Indiana was constructed with Treasury Department funds ca. 1936. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - North St. Paul MNThe historic post office in North St. Paul was constructed in 1938 with federal Treasury Department funds. North St. Paul is a small municipality close to, but separate from, St. Paul, MN. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Northampton PAThe historic Northampton post office building was constructed in 1937-8 with federal Treasury Department funds. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Northfield MNThe distinctive and historic post office in Northfield, Minnesota was constructed in 1936 with Treasury Department funds. The building is still in service.
- Post Office - Northfield VTThe historic Northfield post office was constructed with federal Treasury Department funds in 1937. The building, which houses examples of New Deal artwork, is still in service.
- Post Office - Northport NYThe historic post office building in Northport, New York was designed by Louis A. Simon in conjunction with the United States Treasury Department. The building was added to the National Register of Historic Places in 1989. Construction began in 1935 and the building opened in 1936.
- Post Office - Northumberland PAThe historic post office building in Northumberland, Pennsylvania was constructed with federal Treasury Department funds and opened in 1941. The building, which houses a New Deal bas relief sculpture in its lobby, is still in use today.
- Post Office - Norway METhe historic post office in Norway, Maine was constructed in 1940-1 with federal Treasury Department funds. The building, which houses an example of New Deal artwork, is still in service.
- Post Office - Norwood MAThe post office in Norwood, MA was constructed during the opening months of the New Deal in 1933.
- Post Office - Nowata OKThe historic post office in Nowata, Oklahoma was constructed with federal Treasury Department funds. The building, which houses New Deal artwork inside, was completed in 1940 and is still in use today.
- Post Office - Nutley NJNutley, New Jersey's historic branch post office was built in 1939 with federal Treasury Department funds.
- Post Office - O'Neill NEThe O'Neill United States Post Office is a one-story, brick building constructed in 1937 in the Georgian Revival style by the US Treasury Department.
- Post Office - Oak Harbor OHThe historic post office building in New Lexington, Ohio was constructed with federal Treasury Department funds and completed in 1939. The building, which houses a New Deal mural inside, is still in use today.
- Post Office - Oak Hill WVThe historic post office in Oak Hill, West Virginia was constructed in 1936-7 with federal Treasury Department funds. The handsome building, which houses an example of New Deal artwork, is still in service.
- Post Office - Oak Park ILThe Oak Park post office was designed to accommodate the village’s growing population which rose from 39,858 in 1920 to 80,000 in 1930. Congress appropriated $600,000 prior to new deal legislation in 1931 with an additional $70,000 appropriated in 1935 to complete the project which had been delayed. The post office sits on a prominent parcel of downtown Oak Park which was purchased at a cost of $175,000 from the George R. Hemingway brokerage office. The building was dedicated on August 21, 1936 and remains an active post office today.
- Post Office - Oakdale LAThe historic post office in Oakdale, Louisiana was constructed in 1936 with U.S. Treasury Department funds. The building, which houses a New Deal mural, is still in use today.
- Post Office - Oakes NDThe stately and historic post office in Oakes, North Dakota was constructed with federal funds in 1934-5. The building is still in operation.
- Post Office - Oakland MDA cornerstone on the Oakland, Maryland Post Office shows it to be a project of the Federal Works Administration from 1940.
- Post Office - Oakmont PAThe historic post office building in Oakmont, Pennsylvania was constructed with federal Treasury Department funds in 1941. The building, which houses New Deal artwork inside, is still in use today.
- Post Office - Oakville CTThe historic post office building in Oakville, Connecticut 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 - Oberlin OHThe Oberlin post office was constructed using Treasury Department funds and opened in late 1934.
- Post Office - Ocean City NJThe Treasury Department funded the construction of the Post Office in Ocean City, NJ.
- Post Office - Oceanside CAThis post office, constructed by the federal government in 1935, is home to Elsie Seeds's 1937 mural, "Air Mail," and Stuart Holmes's 1936 wood carving, "Eagle," both for the Treasury Section of Fine Arts.
- Post Office - Oconomowoc WIConstructed by the Treasury in 1936.
- Post Office - Ogallala NEBuilt in 1937 and listed on the National Register of Historic Places.
- Post Office - Okemah OKThe post office in Okemah was completed in 1938 with funds provided by the Treasury Department. It is also the site of Walter Richard "Dick" West's 1941 mural, "Grand Council of 1842," completed with funds provided by the federal government and viewable in the lobby.
- Post Office - Okolona MSThis post office was constructed by the Treasury Department in 1937. It briefly contained a New Deal mural painted by Harold Egan.
- Post Office - Omak WAThe historic post office in Omak, Washington was constructed with federal Treasury Department funds. The building, which was constructed ca. 1935, is still in use today.
- Post Office - Onancock VAThe historic post office in Onancock, Virginia was constructed in 1936 with Treasury Department funds. The building is still in service.