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 Delaware. 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 United States Post Office (Laurel, Delaware)Laurel1935Louis A. Simon, Neal A. MelickUnited States Post Office (Harrington, Delaware)Harrington 1936–1937Louis A. Simon, Neal A. MelickKenton Post OfficeKenton1881unknownOld Post Office (Kirkwood, Delaware) Kirkwood1870unknownUnited States Post Office (New Castle, Delaware)New Castle1935–1936United States Post Office (Rehoboth Beach, Delaware)Rehoboth Beach1937–1938Louis A. Simon, Neal A. MelickUnited States Post Office-Seaford, now Seaford Museum Seaford1935Louis A. Simon, Neal A. MelickUnited States Post Office (Selbyville, Delaware)Selbyville1940Old Customshouse (Wilmington, Delaware)Wilmington1855Ammi B. YoungUnited States Post Office, Courthouse, and Customhouse (Wilmington, Delaware)Wilmington1937 and

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