Most of Mount Sinai was built recently: 3% of its homes predate 1940 and the median home dates from 1987. Below: 6 old photos and papers, maps from 1902 on, and old-book passages.
Mount Sinai was founded in the 1664 as an early European settlement.[1]
The area now known as Mount Sinai was originally called Nonowatuck, or "stream that dries up", by the Seatocot family of Native Americans who lived here. The first European settlers were Colonial settlers living in what is now Setauket, who obtained a deed from these local Native Americans in 1664.
Passages that mention Mount Sinai, cut from the printed page as they were published.
...History of Suffolk county, New York1882 · page 47Read the page →
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At Rocky Point a Congregational lecture room was built in 1849. The society is a branch of the church at Mount Sinai. The land on which the building stands was given for the purpose by Amos Hallock. The principal part of the present village of Wading River lies within the town of Riverhead. The initial step toward establishing a settlement here was taken by Brookhaven in a public town meeting November 17th
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...History of Suffolk county, New York1882 · page 37Read the page →
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garrisoned by about fifty men, and in it two guns were mounted. On the 21st of November Major Tallmadge embarked at Fairfield, Conn., with eighty dismounted dragoons, and landed at 9 in the evening at Mount Sinai,
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Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
By decade
Mount Sinai, decade by decade
3 decades in the archive, from the 1870s to the 1910s. Scroll each row; tap a photo for its story.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
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 (6), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
1902
1915
1915