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History · Armonk

Armonk’s post office opened in 1853, and 1 of its places is on the National Register

Most of Armonk was built recently: 10% of its homes predate 1940 and the median home dates from 1989. Below: 2 old photos and papers from 1867 on.

1853first post office
1on the National Register
10%homes built before 1940
2old photos & papers
5famous people
Add an old photoShare a memory
Photo: ajay_suresh · CC BY 4.0
Quick answers

How Armonk began

When was Armonk founded?

1853

The Armonk post office opened in 1853, the earliest record of the town by name.

2020 census: 4,495173 years
Founding year: the first Armonk post office (Blevins & Helbock, CC0).

What stands out about Armonk’s past

Read from the archive, the National Register and the record. The page puts what stands out first.

A history waiting to be writtenOnly 2 old photos are in the public archives. The rest are in attics and albums.
★ What stands out · Help out

Start Armonk’s collection

The first neighbors to add old photos shape how Armonk’s history is told.

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
Share a family photoSign in to add one+10
The story so far

Armonk, in brief

Wikipedia doesn’t have a history of Armonk yet. The photos, dates and memories neighbors add here are how it gets written.

Armonk is a hamlet and census-designated place (CDP) in the town of North Castle, located in Westchester County, New York, United States. As of the 2020 census, Armonk had a population of 4,495. The corporate headquarters of IBM are located in Armonk.

Its first post office opened in 1853. Between the 2010 and 2020 censuses its population grew from 4,330 to 4,495 (+4%).

Intro from Wikipedia. Population: U.S. Census Bureau.

Timeline

Armonk, 1867 to 1967

Woven from the archive, old maps, post office records, the National Register and the people born here.

  1. 19th century
  2. 1867In the archive1867 Beers North Castle map Armonk closeup
  3. 20th century
  4. 1947Born hereDave Barry is born here
  5. 1955Born herePreston Reed is born here
  6. 1957Born hereSam Barry is born here
  7. 1967Born hereChance Kelly is born here
By decade

Armonk, decade by decade

One decade in the archive so far: the 1860s. Scroll each row; tap a photo for its story.

1860s2 items
1867 Beers North Castle map Armonk closeup18671867 Beers North Castle map Armonk closeupMapTown of North Castle Westchester Co. N.Y1867Town of North Castle Westchester Co. N.YMap
Today4 recent
Witthoefft House2012Witthoefft HouseUntitled photo2012Untitled photoDowntownarmonk2007DowntownarmonkBoies Schiller and Flexner2007Boies Schiller and Flexner
On the National Register

1 listing protects 8 historic buildings

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

place listed
1
National Historic Landmarks
0
none yet
historic buildings protected
8
each building in a district counts

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

Famous people

5 famous people were born in Armonk

Writers, athletes, leaders and more, ranked by how widely they’re known.

See all →
Dave BarryAmerican writer · b. 1947
C
Chance KellyAmerican actor · b. 1967
Preston ReedAmerican musician · b. 1955
S
Sam BarryAmerican author, publisher, and musician · b. 1957
S
Stephen ViscusiAmerican writer
Stories next door

History across the town line

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

North Castle4 historic placesB+New Castle10 historic placesA−

Questions about Armonk’s history

What year was Armonk founded?

The Armonk post office opened in 1853, 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 →
Start a conversation
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 →

From Wikimedia Commons (6) and Wikidata and Wikipedia for famous people. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.