Swans Island’s post office opened in 1844, and 30% of its homes were built before 1940
1 place in town is on the National Register, among them a historic district with 3 buildings. Below: 1 old photo or paper, maps from 1904 on, and the census since 1810.
Swan's Island was first charted in 1606 by Samuel de Champlain's expedition, and at the time was used by local Indians as a seasonal hunting ground.
James Swan, a member of the Sons of Liberty and Boston Tea Party participant, purchased the island in 1786. In 1791, David Smith, an American Revolutionary War veteran, became the first settler of European extraction on the island.
The population grew slowly to more than 1,000 by 1900. Fish processing was the dominant industry into the 1930s, when it became no longer profitable in the area. The state-run ferry, which began service in 1960, helped make Swan's Island a popular summer tourism destination. The ferry also is used to carry the mail to the island.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →
From the Library of Congress (1), Wikidata (1), the National Register of Historic Places (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.