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–Not graded
History · Flanders

Flanders’ post office opened in 1834, and 3 of its places are on the National Register

Most of Flanders was built recently: 5% of its homes predate 1940 and the median home dates from 1975.

1834first post office
3on the National Register
5%homes built before 1940
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Quick answers

How Flanders began

When was Flanders founded?

1834

The Flanders post office opened in 1834, the earliest record of the town by name.

2020 census: 5,098192 years
Founding year: the first Flanders post office (Blevins & Helbock, CC0).
On the National Register

3 historic places in Flanders

The country’s official list of buildings and places worth saving.

places listed
3
National Historic Landmarks
0
none yet
historic buildings protected
6
each building in a district counts

National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.

Stories next door

History across the town line

Each neighbor’s History grade, on the same three inputs.

Hampton Bays2 historic placesnot graded: under 1,000 residents or part of its townRiversideIts storynot graded: under 1,000 residents or part of its townNorthamptonIts storynot graded: under 1,000 residents or part of its townEast QuogueIts storynot graded: under 1,000 residents or part of its townSouthampton37 historic placesARiverhead14 historic placesB

Questions about Flanders’ history

What year was Flanders founded?

The Flanders post office opened in 1834, the earliest record of the town by name (U.S. post office records).

Memory lane

What the archives can’t tell you, neighbors can.

Town Square →
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Sources

Where this page comes from

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 →