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 Hampshire. 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 builtImageArchitectNotesOld Post Office (Concord, New Hampshire), now New Hampshire Legislative Office BuildingConcord1884–1889James Riggs HillUnited States Post Office (Dover, New Hampshire)Dover1911James Knox TaylorHinsdale Post OfficeHinsdale1816Nathan BabbittU.S. Post Office-Laconia MainLaconia1917James A. WetmoreUnited States Post Office–Lancaster MainLancaster1935Louis A. Simon, Neal A. MelickUnited States Post Office (Lebanon, New Hampshire)Lebanon1937United States Post Office and Courthouse–Littleton MainLittleton1933James A. WetmoreOld Post Office BlockManchester1876unknownUnited States Post Office (Milford, New Hampshire)Milford1939United States Post Office (Meredith, New Hampshire)Meredith1935–1936Louis A. Simon, Neal A. MelickUnited States Post Office (Newport, New Hampshire)Newport1934–1935U.S. Post Office-Peterborough MainPeterborough1936Louis A. Simon, Loucke & ClarkUnited States Post Office (Plymouth, New Hampshire)Plymouth1936–1937Louis A. Simon, Neal A. MelickUnited States Post Office (Somersworth, New Hampshire)Somersworth1931James A. Wetmore, N. H. TurnbullUnited States Post Office (Wolfeboro, New Hampshire)Wolfeboro1937United States Post Office (Woodsville, New Hampshire)Woodsville1942

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