The Peterboro Land Office is located in the hamlet of Peterboro, in the Town of Smithfield in Madison County, New York. The small, Federal style building was built in 1804. It was constructed of locally produced brick laid in Flemish bond on the facade and common bond elsewhere. The main room is 24 by 28 feet (7.3 by 8.5 m). The interior has plaster walls and ceiling and a brick over plank floor. The entrance vestibule is in the center of the south wall between two windows. There is a window each on the east and west walls. The north walls has built in shelves and drawers on the east side and a 4-foot-high (1.2 m) iron vault door on the west side.