Founding year: the first Clementon post office (Blevins & Helbock, CC0). Wikidata: 1925.The full story ↓
History grade
What drives Clementon’s History grade
On its age, its old homes and the National Register, Clementon is more historic than 41% of U.S. towns, #350 of 468 in New Jersey. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
C+
HistoryA character grade: shown, never part of Clementon’s overall grade.
New Jersey towns list more on the Register than most of the country (a typical New Jersey town has 3.7 per 10,000 residents, the U.S. 2.4), so Clementon’s 0.0 sits below most of its state (12% of New Jersey 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 D to B. The pre-1940 share is a Census survey estimate (±6.6 points). The founding year is the first post office, not a stated founding date; Wikidata gives 1925.
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 →
What stands out about Clementon’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Around 1800, Jonathon Haines built a glass factory in what is now Clementon, situated on a large hill across the street from the modern day Clementon Park. Large amounts of dirt, gravel and marl from the large hill the glass works were situated on were removed for use at a planned new post office in 1961. Sometime around 1811, Samuel Clement of Haddonfield purchased the glass works and named them the Gloucester Glass works, and named the small settlement around the plant as Clementon village. Haines remained as a superintendent and at some point repurchased the works from Clement.
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
The Clementon post office opened in 1886, the earliest record of the town by name (U.S. post office records). Wikidata gives 1925.
How does Clementon rank for history?
Clementon is more historic than 41% of U.S. towns, #350 of 468 in New Jersey. 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 Clementon?
25% of Clementon’s homes were built before 1940 (Census estimate, ±6.6 points), against a typical 15% for a New Jersey town; the median home was built in 1965.
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), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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