Founding year: Wikipedia. First post office: 1851.
History grade
What drives Proviso Township’s History grade
On its age, its old homes and the National Register, Proviso Township is more historic than 77% of U.S. towns, #209 of 768 in Illinois. Its share of homes from before 1940 holds the grade up; its age pulls it down.
A−
HistoryA character grade: shown, never part of Proviso Township’s overall grade.
Among the 400 U.S. cities of 100,000 or more, Proviso Township ranks #138 on History.
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 Proviso Township’s 3.3 sits above most of its state (71% of Illinois towns have fewer) while its 48 historic buildings outnumber those of 85% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from B to A. The pre-1940 share (±1.3 points) is firm at this size. Two sources give 1850.
Founding year: Wikipedia (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 Proviso Township’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
On the map
Proviso Township on the map, 1891 to 1993
Every edition of the U.S. Geological Survey’s map of Proviso Township. Tap a year, or press play to watch the town change.
1891Riverside 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 Proviso Township.
The story so far
Proviso Township, in brief
Wikipedia doesn’t have a history of Proviso Township yet. The photos, dates and memories neighbors add here are how it gets written.
Proviso Township is one of 29 townships in Cook County, Illinois, United States. As of the 2020 census, its population was 151,209. It was organized in 1850 and originally named "Taylor", but shortly afterward its name was changed to make reference to the Wilmot Proviso, a contemporary piece of legislation intended to stop the spread of slavery. The Proviso Township government office is located at 4565 West Harrison Street, Hillside, IL 60162.
Proviso Township was established in 1850. Its population held steady between the last two censuses: 151,704 in 2010, 151,209 in 2020.
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Proviso Township, 1850 to 1929
Woven from the archive, old maps, post office records, the National Register and the people born here.
In 1850, according to Wikipedia’s history of the town. Proviso Township’s post office opened in 1851, and the census of 1930 counted 69,519 people here.
How does Proviso Township rank for history?
Proviso Township is more historic than 77% of U.S. towns, #209 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.
What is on the National Register in Proviso Township?
20 listings: 1 historic district, the Hines, Edward Jr., Veterans Administration Hospital Historic District, with 26 contributing buildings. 48 historic buildings in all.
How old are the homes in Proviso Township?
28% of Proviso Township’s homes were built before 1940 (Census estimate, ±1.3 points), against a typical 11% for an Illinois town; the median home was built in 1955.
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), Wikidata and Wikipedia for famous people, 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.
