Fenwick Island is a coastal town in Sussex County, Delaware, United States. According to 2010 census figures, the population of the town is 379, a 10.8% increase over the last decade. It is part of the Seaford, Delaware Micropolitan Statistical Area. Fenwick Island and its neighbors to the north, Bethany Beach and South Bethany are popularly known as "The Quiet Resorts". This is in contradistinction to the wild atmosphere of Dewey Beach and the cosmopolitan bustle of Rehoboth Beach.