High Quality Content by WIKIPEDIA articles! Arrowsic is a town in Sagadahoc County, Maine, United States. The population was 427 at the 2010 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. During the French and Indian Wars, Arrowsic was site of a succession of important and embattled colonial settlements. It is a favorite with artists and birdwatchers.