More historic than 34% of U.S. towns · #909 of 1,035 in Pennsylvania. What drives it
Most of Ohio Township was built recently: 2% of its homes predate 1940 and the median home dates from 2002. Below: maps from 1906 on and the census since 1970.
Founding year: Wikidata. First post office: 1896.The full story ↓
History grade
What drives Ohio Township’s History grade
On its age, its old homes and the National Register, Ohio Township is more historic than 34% of U.S. towns, #909 of 1,035 in Pennsylvania. Its age holds the grade up; its share of homes from before 1940 pulls it down.
C
HistoryA character grade: shown, never part of Ohio 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 Ohio 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.
NoteThe founding year comes from Wikidata alone; no second source gives 1803.
How sure. Graded on any two of the three inputs instead, the letter would range from D to B−. The pre-1940 share (±2.0 points) is firm at this size.
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 Ohio Township’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Every edition of the U.S. Geological Survey’s map of Ohio 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 Ohio Township.
Timeline
Ohio Township, 1803 to 1906
Woven from the archive, old maps, post office records, the National Register and the people born here.
As reported in the History of Allegheny County, Pennsylvania, Ohio was the third township to be formed in Allegheny County north of the Ohio River, and it was the first subdivision of Pine township. Its creation was begun in December 1802, when a petition was filed in the court of quarter sessions. Gen. John Neville signed this petition. After considerable discussion as to where the boundary line would be created, at the September term of 1803, the court confirmed absolutely a division line which is currently the western boundaries of the current jurisdictions of Pine, McCandless, and Ross townships and Bellevue Borough, including that area of Allegheny County located west of this boundary line and north of the Ohio River as well as including Neville Island.
In 1803, according to Wikidata. Ohio Township’s post office opened in 1896, and the census of 1970 counted 2,096 people here.
How does Ohio Township rank for history?
Ohio Township is more historic than 34% of U.S. towns, #909 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 Ohio Township?
2% of Ohio Township’s homes were built before 1940 (Census estimate, ±2.0 points), against a typical 18% for a Pennsylvania town; the median home was built in 2002.
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 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.
