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 New Mexico. 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 builtImageArchitectNotesAlamogordo Main Post Office, later Lincoln National Forest Service BuildingAlamogordo1938Gilbert Stanley Underwood, Louis A. Simon, Neal A. MelickOld Post Office (Albuquerque, New Mexico)Albuquerque1908James Knox TaylorUnited States Post Office (Carlsbad, New Mexico)Carlsbad1938Old Clovis Post Office, now Carver-Clovis Public LibraryClovis1931James A. Wetmore, Louis A. SimonDeming Main Post OfficeDeming1936Louis A. SimonUnited States Post Office (Gallup, New Mexico)Gallup1933James A. WetmoreOld Las Vegas Post OfficeLas Vegas1927James A. WetmoreLos Alamos United States Post OfficeLos Alamos1948W. C. Kruger and AssociatesPortales Main Post OfficePortales1936–1937Louis A. Simon, Neal A. MelickUnited States Post Office (Silver City, New Mexico)Silver City1934Louis A. Simon, George O. Von NertaUnited States Post Office (Truth or Consequences, New Mexico)Truth or Consequences1940Louis A. Simon

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