The Peterborough Main Post Office is located at 23 Grove Street in Peterborough, New Hampshire. The single-story brick building was designed by Louis A. Simon and completed in 1936. It features simple Georgian Revival styling and a standard floor plan for post offices of the period. It is distinctive because it is virtually unaltered since its construction, and its interior features a WPA mural by Marguerite Zorach.The building was listed on the National Register of Historic Places in 1986.
