44% of Isle au Haut’s homes were built before 1940
2 places in town are on the National Register, among them a historic district with 4 buildings. Below: 3 old photos and papers, maps from 1904 on, and the census since 1830.
Native Americans left behind shell mounds on the island following their oyster feasts. It was territory of the Penobscot Abenaki Indians when, in 1604, French explorer Samuel de Champlain named it Isle au Haut, meaning High Island. English Capt. John Smith, charting the coast in 1614, noted that it was the highest island in Penobscot Bay. It was included in Deer Isle Plantation, incorporated by Massachusetts on February 2, 1789, as the town of Deer Isle.
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 Wikimedia Commons (4), the Library of Congress (1), the National Register of Historic Places (2), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) 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.