Most of Allen was built recently: 6% of its homes predate 1940 and the median home dates from 1968. Below: maps from 1916 on and the census since 1920.
Allen was first settled in the early 19th century. The first post office was named "Mouth of Beaver" and was established on August 21, 1854 (Thomas P. Johns, postmaster). The town began to develop rapidly c. 1904-1905 after the establishment of a Chesapeake and Ohio Railway station. The station was interchangeably known as "Beaver Creek" and "Beaver Creek Junction". In 1905, another post office opened and was named "Allen" after local resident T.J. Allen. The town was formally incorporated by the state assembly in 1913. In 1936, the railroad station was renamed to prevent confusion during mail delivery. An area outside the city limits known as "New Allen" began to develop in 1937 after a bridge was constructed across the Levisa Fork River.
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 (4), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) 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.