In 1788, when Allegheny County was formed, the area now known as Penn Hills was part of Pitt Township. On January 16, 1850, Robert Logan, Thomas Davison and Daniel Bieber were appointed by the court to review the boundaries of a new township to be formed from the northern part of Wilkins. This new township was formed and named Adams, until August 1850 when the action of the court was reconsidered to change the name to McNair Township. The name was again changed to Penn Township by Act of Assembly and approved on February 10, 1851. In 1958 Penn Township became Penn Hills Township, and in 1976 Penn Hills became a home rule municipality. The earliest population was given in 1860, when there were 1,821 people living in Penn Township. The population grew to 2,685 in 1870 and 3,291 in 1880.
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 (1), the National Register of Historic Places (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.