Southport is a town and island in Lincoln County, Maine, United States.

[3] It includes the neighborhoods of Capitol Island, Cozy Harbor, East Side, Newagen, Pine Cliff, and West Southport, and the village of Squirrel Island.

The Abenaki people who originally inhabited the island called it Capanewagen.

[5] While the first European settlement was established in 1623, the island was abandoned by the English when they were driven from the region by the Abenaki during King Phillip's War in 1676.

After 40 years, colonists again returned to the region in 1730, and established a settlement called Townsend, named after Lord Charles Townshend.

Southport Island is connected by a green swing bridge to the adjacent town of Boothbay Harbor.

33.2% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older.

29.9% of all households were made up of individuals, and 14.5% had someone living alone who was 65 years of age or older.