Peaked at 258 in 1940; 102 people lived here in 2020.
16 censuses, 1870–2020.
U.S. Census Bureau decennial counts, from the census table on Donegal’s Wikipedia page.
The story so far
Donegal, in brief
Wikipedia doesn’t have a history of Donegal yet. The photos, dates and memories neighbors add here are how it gets written.
There are also three Donegal Townships in Pennsylvania. Donegal is a borough in Westmoreland County, Pennsylvania, United States. It is a distinct municipality from the adjacent Donegal Township. The population was 103 at the 2020 census. Donegal is best known as an exit on the Pennsylvania Turnpike with restaurants, gas stations, and two hotels for travelers. It was named after the town and county of Donegal in Ireland.
Donegal was established in 1796. Between the 2010 and 2020 censuses its population fell from 120 to 102 (-15%).
Intro from Wikipedia. Population: U.S. Census Bureau.
From the old history books
What they wrote about Donegal in 1906
Passages that mention Donegal, cut from the printed page as they were published.
History of Westmoreland county, Pennsylvania1906 · page 414Read the page →
Read the text
He was reared to farm life under the parental roof, and assisted in the operation of the home farm until twenty-one years of age. He also carried the mail from Jones' Mill to Somerset, Pennsylvania, and on attaining his majority he .began farming on his own account, in Donegal township, on land belonging to his father-in-law. This he continued to cultivate and improve for three years, at the end of which time he purchased a farm in Donegal township, located on the Four Mile Run and known as a part of the John Porch farm.
Text read by machine from the scan; it may contain errors.
Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
Timeline
Donegal, 1796 to 1940
Woven from the archive, old maps, post office records, the National Register and the people born here.
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.
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 (8), Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.