Founding year: Wikidata; Wikipedia’s history section gives the same year. First post office: 1889.The full story ↓
History grade
What drives Harmony Township’s History grade
On its age, its old homes and the National Register, Harmony Township is more historic than 56% of U.S. towns, #659 of 1,035 in Pennsylvania. Its age holds the grade up; its National Register listings pull it down.
B
HistoryA character grade: shown, never part of Harmony Township’s overall grade.
Pennsylvania towns list about as much on the Register as the country (a typical Pennsylvania town has 2.1 per 10,000 residents, the U.S. 2.4), so Harmony Township’s 0.0 sits below most of its state (25% of Pennsylvania towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C+ to B+. The pre-1940 share is a Census survey estimate (±4.6 points). Two sources give 1804.
Founding year: Wikidata (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Harmony Township’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Peaked at 1,334 in 1980; 942 people lived here in 2020.
18 censuses, 1850–2020.
U.S. Census Bureau decennial counts, from the census table on Harmony Township’s Wikipedia page.
On the map
Harmony Township on the map, 1906 to 1990
Every edition of the U.S. Geological Survey’s map of Harmony Township. Tap a year, or press play to watch the town change.
1906Sewickley 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 Harmony Township.
In December 1753, George Washington and Christopher Gist came through the area. They were shot at somewhere between present-day Evans City and Ellwood City (the exact location is unknown), through a region above the forks of the Ohio known as Mutheringtown or "Murdering Town". In 2003, the borough commemorated the event as part of the 250th Anniversary Commemoration of the French and Indian War.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
In 1804, according to Wikidata and Wikipedia’s history of the town. Harmony Township’s post office opened in 1889, and the census of 1850 counted 441 people here.
How does Harmony Township rank for history?
Harmony Township is more historic than 56% of U.S. towns, #659 of 1,035 in Pennsylvania. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in Harmony Township?
15% of Harmony Township’s homes were built before 1940 (Census estimate, ±4.6 points), against a typical 18% for a Pennsylvania town; the median home was built in 1951.
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).
From Wikimedia Commons (6), 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.
1901
1901
1901