How Pine Grove Township came to be
From Wikipedia’s history of Pine Grove Township.
The Guy C. Irvine House was added to the National Register of Historic Places in 1978.
Text from Wikipedia, licensed CC BY-SA 4.0.
Each edition grades its towns against each other only.
More historic than 81% of U.S. towns. What drives it
Its Register listing is the Guy C. Irvine House. Its Register listing is the Guy C. Irvine House. Below: maps from 1906 on and the census since 2000.
The Pine Grove Township post office opened in 1822, the earliest record of the town by name. Four smaller post offices, Pine Grove (1822), Russellsburgh (1835) and Ackley Station (1878), opened inside today’s town and later closed.
More historic than 81% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Pine Grove Township is more historic than 81% of U.S. towns. All 3 inputs are above most U.S. towns; its age ranks highest and its share of homes from before 1940 lowest.
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 Pine Grove Township’s 7.9 sits above most of its state (73% of Pennsylvania towns have fewer) while its 2 historic buildings outnumber those of 60% of U.S. towns.
Founding year: the first post office (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 →
Read from the archive, the National Register and the record. The page puts what stands out first.
Four other post offices opened and closed inside today’s town.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
The first neighbors to add old photos shape how Pine Grove Township’s history is told.
Every edition of the U.S. Geological Survey’s map of Pine Grove Township. Tap a year, or press play to watch the town change.

U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Pine Grove Township.
From Wikipedia’s history of Pine Grove Township.
The Guy C. Irvine House was added to the National Register of Historic Places in 1978.
Text from Wikipedia, licensed CC BY-SA 4.0.
Woven from the archive, old maps, post office records, the National Register and the people born here.
Born hereGeorge W. Allen is born here
On the mapFirst mapped by the U.S. Geological SurveyThe country’s official list of buildings and places worth saving.
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Between 2,599 and 2,712 people in every census since 2000.
3 censuses, 2000–2020.
U.S. Census Bureau decennial counts, from the census table on Pine Grove Township’s Wikipedia page.
Each neighbor’s History grade, on the same three inputs.
The Pine Grove Township post office opened in 1822, the earliest record of the town by name (U.S. post office records).
Pine Grove Township is more historic than 81% of U.S. towns. 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.
One place: the Guy C. Irvine House (listed 1978).
18% of Pine Grove Township’s homes were built before 1940 (Census estimate, ±4.9 points), against a typical 18% for a Pennsylvania town; the median home was built in 1970.
What the archives can’t tell you, neighbors can.
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 (5), the National Register of Historic Places (1), Wikipedia, Wikidata and Wikipedia for famous people, 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.

1906Warren sheet · 1:62,500