Sagadahoc County Maine (Vacant / Not In Use) has 11 places on the National Register of Historic Places including 5 places of Statewide significance. Significant places include Clarke and Lake Company Archeological Site, Percy and Small Shipyard, Perkins Island Light Station, Squirrel Point Light Station and Winter Street Chruch.
Some of the country's most noteable architects helped create the Sagadahoc County places including US Army Corps of Engineers, Anthony Raymond, William D. Leonard and Harry S. Coombs. Prominent architectural styles found in Sagadahoc Country are Colonial Revival, Gothic Revival and Queen Anne.