Lost two-thirds of its people between 1910 and 1930, then grew 8-fold.
12 censuses, 1900–2020.
U.S. Census Bureau decennial counts, from the census table on Fenwick’s Wikipedia page.
On the map
Fenwick on the map, 1893 to 1970
Every edition of the U.S. Geological Survey’s map of Fenwick. Tap a year, or press play to watch the town change.
1893Saybrook sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Fenwick.
The story so far
Fenwick, in brief
Wikipedia doesn’t have a history of Fenwick yet. The photos, dates and memories neighbors add here are how it gets written.
Fenwick is a borough in Middlesex County, Connecticut, United States, in the town of Old Saybrook. The borough is part of the Lower Connecticut River Valley Planning Region. The population was 53 at the 2020 census, making it the least populous borough in Connecticut. Most of the borough is included in the Fenwick Historic District, listed on the National Register of Historic Places. Fenwick is set off from the town center of Old Saybrook by a large cove crossed by a causeway. It is located exactly where the Connecticut River flows into Long Island Sound, and sits on the river's west side. The town has two lighthouses, the Inner and the Outer. The Inner is at the tip of Lynde Point, Fenwick…
Its first post office opened in 1900. Between the 2010 and 2020 censuses its population grew from 43 to 53 (+23%).
Intro from Wikipedia. Population: U.S. Census Bureau.
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 (1), U.S. Geological Survey historical maps and U.S. Census counts (via Wikipedia). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.