The original name of the town was Brookside, and subsequently Sunnyside in the 1890s, but was changed for the railroad, by the time of its incorporation as a borough, due to an existing stop with the same name in Lancaster, Pennsylvania. It is unknown how the name Valencia was chosen. The borough's application for incorporation was granted in September 1896, and the office of burgess (later mayor) was established, to which James Douthett Magee was appointed, together with a seven-member council consisting of Edward Cowan, J. D. Perry, C. F. Harrobin, J. A. Cox, J. C. Barr, P. E. Cooper, and W. J. Craig.
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 (2), 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.