Sagadahoc County Maine (Historic Districts) has 13 places on the National Register of Historic Places including 6 places of Statewide significance. Significant places include Doubling Point Light Station, Kennebec River Light Station, Percy and Small Shipyard, Perkins Island Light Station and Squirrel Point Light Station.
Some of the country's most noteable architects helped create the Sagadahoc County places including US Army Corps of Engineers. Prominent architectural styles found in Sagadahoc Country are Federal, Greek Revival and Late Victorian.