Each edition grades its towns against each other only.
Most of Sangamon Valley Township was built recently: 4% of its homes predate 1940 and the median home dates from 1995. Below: maps from 1930 on and the census since 1930.
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 Sangamon Valley Township’s history is told.
Wikipedia doesn’t have a history of Sangamon Valley Township yet. The photos, dates and memories neighbors add here are how it gets written.
Sangamon Valley Township is one of eleven townships in Cass County, Illinois, USA. As of the 2020 census, its population was 330 and it contained 160 housing units.
Its population held steady between the last two censuses: 328 in 2010, 330 in 2020.
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 SurveyEvery edition of the U.S. Geological Survey’s map of Sangamon Valley 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 Valley Township.
Between 328 and 610 people in every census since 1930.
10 censuses, 1930–2020.
U.S. Census Bureau decennial counts, from the census table on Sangamon Valley Township’s Wikipedia page.
Nobody well known was born in Sangamon Valley Township itself, so here are the best known from just nearby.
Another post office, Jules, 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).
Each neighbor’s History grade, on the same three inputs.
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). How TownRatings grades history →
From Wikimedia Commons (2), 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.
2026
2026
