Each edition grades its towns against each other only.
More historic than 69% of U.S. towns · #495 of 1,035 in Pennsylvania. What drives it
Most of Edgmont Township was built recently: 5% of its homes predate 1940 and the median home dates from 1991. Below: maps from 1894 on and the census since 1930.
More historic than 69% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Edgmont Township is more historic than 69% of U.S. towns, #495 of 1,035 in Pennsylvania. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
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 Edgmont Township’s 201 sits above most of its state (91% of Pennsylvania towns have fewer) while its 90 historic buildings outnumber those of 89% of U.S. towns.
Founding year: our sources. 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.
The first neighbors to add old photos shape how Edgmont Township’s history is told.
The 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.
Every edition of the U.S. Geological Survey’s map of Edgmont 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 Edgmont Township.
Wikipedia doesn’t have a history of Edgmont Township yet. The photos, dates and memories neighbors add here are how it gets written.
Edgmont Township is a township in Delaware County, Pennsylvania, United States. Edgmont contains the unincorporated community of Gradyville. The population was 3,987 at the 2010 census.
Between the 2010 and 2020 censuses its population grew from 3,987 to 4,283 (+7%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Woven from the archive, old maps, post office records, the National Register and the people born here.
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Grew from 874 people in 1930 to 4,283 in 2020, 4 times over.
10 censuses, 1930–2020.
U.S. Census Bureau decennial counts, from the census table on Edgmont Township’s Wikipedia page.
Nobody well known was born in Edgmont Township itself, so here are the best known from just nearby.
Old hamlets and crossroads still carry their names on the map.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Each neighbor’s History grade, on the same three inputs.
Edgmont Township is more historic than 69% of U.S. towns, #495 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.
One place: the Ridley Creek State Park (listed 1976).
5% of Edgmont Township’s homes were built before 1940 (Census estimate, ±2.9 points), against a typical 18% for a Pennsylvania town; the median home was built in 1991.
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 the National Register of Historic Places (1), 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.
