Every edition of the U.S. Geological Survey’s map of Washington Township. Tap a year, or press play to watch the town change.
1892Lykens sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Washington Township.
People over time
Washington Township, census by census
Peaked at 26,280 in 1950; 13,176 people lived here in 2020.
22 censuses, 1810–2020.
U.S. Census Bureau decennial counts, from the census table on Washington Township’s Wikipedia page.
The French labeled the area "Wissameking", meaning "catfish place", as early as 1757.
The area of Washington was settled by many immigrants from Scotland and the north of Ireland along with settlers from eastern and central parts of the Colony of Virginia, first settled around 1768.
The Pennsylvania General Assembly passed an act on March 28, 1781, establishing the County of Washington and naming "Catfish Camp" as the place for holding the first election.
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 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.