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Allison is an unincorporated community and census-designated place (CDP), which is located in Luzerne and Redstone townships in Fayette County, Pennsylvania, United States. It is situated 3 miles (5 km) south of the borough of Brownsville. As of the 2020 census, Allison had a population of 503. The CDP includes the neighborhood of Allison Heights in Luzerne Township. Dunlap Creek flows through the center of the CDP, forming the border between Luzerne and Redstone townships.
Its first post office opened in 1913. Between the 2010 and 2020 censuses its population fell from 625 to 503 (-20%).
Intro from Wikipedia. Population: U.S. Census Bureau.
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 the Library of Congress (1). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.