Each edition grades its towns against each other only.
More historic than 20% of U.S. towns · #637 of 768 in Illinois. What drives it
Most of Sangamon Township was built recently: 5% of its homes predate 1940 and the median home dates from 1992. Below: maps from 1937 on.
More historic than 20% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Sangamon Township is more historic than 20% of U.S. towns, #637 of 768 in Illinois. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
Few Illinois towns list much on the Register (a typical Illinois town has 0.5 per 10,000 residents, the U.S. 2.4), so Sangamon Township’s 0.0 sits below most of its state (28% of Illinois towns have fewer) while its 0 listings outnumber those of 23% 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.
Five 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 Sangamon Township’s history is told.
Wikipedia doesn’t have a history of Sangamon Township yet. The photos, dates and memories neighbors add here are how it gets written.
Sangamon Township is a township in Piatt County, Illinois, USA. As of the 2010 census, its population was 2,357 and it contained 929 housing units.
Between the 2010 and 2020 censuses its population grew from 2,357 to 2,457 (+4%).
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.
On the mapFirst mapped by the U.S. Geological SurveyWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Every edition of the U.S. Geological Survey’s map of Sangamon 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 Sangamon Township.
Nobody well known was born in Sangamon Township itself, so here are the best known from just nearby.
Each neighbor’s History grade, on the same three inputs.
Sangamon Township is more historic than 20% of U.S. towns, #637 of 768 in Illinois. 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.
5% of Sangamon Township’s homes were built before 1940 (Census estimate, ±3.0 points), against a typical 11% for an Illinois town; the median home was built in 1992.
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 U.S. Geological Survey historical maps, 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.
