The U.S. Customhouse and Post Office is a historic federal government building in Waldoboro, Maine.

Its exterior is distinguished by the large round-arch openings housing the windows and doors, the metal balcony spanning much of the front facade, and the elaborate cornice.

[2] The Waldoboro customs district was established in 1799 and abolished in 1913, and encompassed ports in both Knox and Lincoln Counties.

Young the Supervising Architect of the United States Treasury Department.

It is one of Young's smaller designs, but highlights his emphasis on Italianate styling and the use of fire-resistant materials throughout.