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History · Twin Rocks

Twin Rocks’ post office opened in 1929, and 53% of its homes were built before 1940

Below: maps from 1902 on.

1929first post office
0on the National Register
53%homes built before 1940
1famous people
Add an old photoShare a memory
Quick answers

How Twin Rocks began

When was Twin Rocks founded?

1929

The Twin Rocks post office opened in 1929, the earliest record of the town by name.

97 years
Founding year: the first Twin Rocks post office (Blevins & Helbock, CC0).

What stands out about Twin Rocks’ past

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

A history waiting to be writtenNo old photos of Twin Rocks are in the public archives yet. The rest are in attics and albums.Old housesHalf of Twin Rocks’ homes were built before 1938.On the map since 19023 editions of the USGS map, 1902 to 1972. Watch Twin Rocks change.
★ What stands out · Help out

Start Twin Rocks’s collection

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

Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
0 of 10 decades. The empty ones are waiting for someone’s album.
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The story so far

Twin Rocks, in brief

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

Twin Rocks (also known as Expedit) is an unincorporated community in Cambria County, Pennsylvania, United States. The community is located along Pennsylvania Route 271, 2.4 miles (3.9 km) northwest of Nanty Glo. Twin Rocks has a post office with ZIP code 15960.

Its first post office opened in 1929.

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

On the map

Twin Rocks on the map, 1902 to 1972

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

Twin Rocks on the 1902 USGS mapTwin Rocks on the 1961 USGS mapTwin Rocks on the 1972 USGS map1902Barnesboro 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 Twin Rocks.

By decade

No old photos in the archives yet

Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.

Be the first to add onePhotograph a print flat, in daylight, no flash.
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Stories next door

History across the town line

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

Blacklick TownshipIts storyBJackson TownshipIts storyC

Questions about Twin Rocks’ history

What year was Twin Rocks founded?

The Twin Rocks post office opened in 1929, 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 →

From Wikidata and Wikipedia for famous people 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.