Bloom Township’s post office opened in 1850, and 3 of its places are on the National Register
More historic than 45% of U.S. towns · #433 of 768 in Illinois. What drives it
Most of Bloom Township was built recently: 8% of its homes predate 1940 and the median home dates from 1966. Its Register listings are . Below: maps from 1892 on and the census since 2000.
Founding year: the first Bloom Township post office (Blevins & Helbock, CC0).
History grade
What drives Bloom Township’s History grade
On its age, its old homes and the National Register, Bloom Township is more historic than 45% of U.S. towns, #433 of 768 in Illinois. Its National Register listings hold the grade up; its age pulls it down.
C+
HistoryA character grade: shown, never part of Bloom Township’s overall grade.
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 Bloom Township’s 0.4 sits near the middle of its state (59% of Illinois towns have fewer) while its 3 listings outnumber those of 65% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C to B−. The pre-1940 share (±1.3 points) is firm at this size. The founding year is the first post office, not a stated founding date.
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 Bloom 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 Bloom Township. Tap a year, or press play to watch the town change.
1892Calumet 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 Bloom Township.
The story so far
Bloom Township, in brief
Wikipedia doesn’t have a history of Bloom Township yet. The photos, dates and memories neighbors add here are how it gets written.
Bloom Township is one of 29 townships in Cook County, Illinois, USA. As of the 2020 census, its population was 86,018 and it contained 33,964 housing units.
Its first post office opened in 1850. Between the 2010 and 2020 censuses its population fell from 90,922 to 86,018 (-5%).
Intro from Wikipedia. Population: U.S. Census Bureau.
By decade
No old photos in the archives yet
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Be the first to add onePhotograph a print flat, in daylight, no flash.
The Bloom Township post office opened in 1850, the earliest record of the town by name (U.S. post office records).
How does Bloom Township rank for history?
Bloom Township is more historic than 45% of U.S. towns, #433 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.
How old are the homes in Bloom Township?
8% of Bloom 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 1966.
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, U.S. Census counts (via Wikipedia) 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.
