11% of North Codorus Township’s homes were built before 1940
More historic than 62% of U.S. towns · #579 of 1,035 in Pennsylvania. What drives it
Its Register listings are the Hanover Junction Railroad Station, the York Iron Company Mine and the Howard Tunnel, Northern Central Railway. Below: maps from 1920 on and the census since 2000.
What drives North Codorus Township’s History grade
On its age, its old homes and the National Register, North Codorus Township is more historic than 62% of U.S. towns, #579 of 1,035 in Pennsylvania. All 2 inputs are above most U.S. towns; its National Register listings ranks highest and its share of homes from before 1940 lowest.
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HistoryA character grade: shown, never part of North Codorus 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 North Codorus Township’s 3.3 sits near the middle of its state (62% of Pennsylvania towns have fewer) while its 3 listings outnumber those of 65% of U.S. towns.
How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share is a Census survey estimate (±3.7 points).
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 →
What stands out about North Codorus 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 North Codorus Township. Tap a year, or press play to watch the town change.
1920Hanover 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 North Codorus Township.
The story
How North Codorus Township came to be
From Wikipedia’s history of North Codorus Township.
North Codorus Township was split off from Codorus Township, Pennsylvania in 1840.
The Hanover Junction Railroad Station, Howard Tunnel, Northern Central Railway, and York Iron Company Mine are listed on the National Register of Historic Places.
On September 17, 2025, Matthew Ruth, shot five police officers, killing three, while serving an arrest warrant. He was later shot and killed by police.
North Codorus Township is more historic than 62% of U.S. towns, #579 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.
What is on the National Register in North Codorus Township?
Three places: the Hanover Junction Railroad Station (listed 1983), the York Iron Company Mine (1985) and the Howard Tunnel, Northern Central Railway (1995).
How old are the homes in North Codorus Township?
11% of North Codorus Township’s homes were built before 1940 (Census estimate, ±3.7 points), against a typical 18% for a Pennsylvania town; the median home was built in 1982.
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 Wikidata (1), the National Register of Historic Places (3), 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.
