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History · Allenwood

Allenwood’s post office opened in 1876, and 41% of its homes were built before 1940

Below: 4 old photos and papers and maps from 1924 on.

1876first post office
0on the National Register
41%homes built before 1940
4old photos & papers
Add an old photoShare a memory
From Allenwood’s archive · credits on each photo
Quick answers

How Allenwood began

When was Allenwood founded?

1876

The Allenwood post office opened in 1876, the earliest record of the town by name.

2020 census: 334150 years
Founding year: the first Allenwood post office (Blevins & Helbock, CC0).

What stands out about Allenwood’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 4 old photos are in the public archives. The rest are in attics and albums.Old housesHalf of Allenwood’s homes were built before 1956.On the map since 19244 editions of the USGS map, 1924 to 1973. Watch Allenwood change.
★ What stands out · Help out

Start Allenwood’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
1 of 10 decades. The empty ones are waiting for someone’s album.
Date a photo1 archive item has no date. Guess the decade.+2Retake an old viewPennsylvania: stand where they stood+15Share a family photoSign in to add one+10
The story so far

Allenwood, in brief

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

Allenwood (also called Union Town) is a census-designated place in Gregg Township, Union County, Pennsylvania, United States. As of the 2020 census, Allenwood had a population of 334. Federal Correctional Complex, Allenwood is located in Gregg Township, outside of the CDP boundaries.

Its first post office opened in 1876. Between the 2010 and 2020 censuses its population grew from 321 to 334 (+4%).

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

On the map

Allenwood on the map, 1924 to 1973

Every edition of the U.S. Geological Survey’s map of Allenwood. Tap a year, or press play to watch the town change.

Allenwood on the 1924 USGS mapAllenwood on the 1953 USGS mapAllenwood on the 1965 USGS mapAllenwood on the 1973 USGS map1924Milton 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 Allenwood.

By decade

Allenwood, decade by decade

One decade in the archive so far: the 1910s. Scroll each row; tap a photo for its story.

1910s3 items
Pennsylvania1917PennsylvaniaPennsylvania1917PennsylvaniaPennsylvania1917Pennsylvania
1920s–1990snothing yet
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.
Add from your album
Date unknown1 to date
Allenwood Bridge, Spanning West Branch of Susquehanna River on State Route 44, Dewart, Northumberland County, PADate?Allenwood Bridge, Spanning West Branch of Susquehanna…
Today2 recent
PA 44 sb entering Allenwood, Aug. 20242024PA 44 sb entering Allenwood, Aug. 2024US 15 nb at PA 44, July 20232023US 15 nb at PA 44, July 2023
Then & now

Stand where they stood

No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.

Pennsylvania
Retake this viewPennsylvania, 1917

Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Allenwood’s page.

Retake this view · +15
Stories next door

History across the town line

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

Gregg Township1 historic placeA−Delaware Township4 historic placesB

Questions about Allenwood’s history

What year was Allenwood founded?

The Allenwood post office opened in 1876, 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 (5), the Library of Congress (1) and U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.