Founding year: Wikidata. First post office: 1892.The full story ↓
History grade
What drives Brookfield’s History grade
On its age, its old homes and the National Register, Brookfield is more historic than 67% of U.S. towns, #279 of 768 in Illinois. Its share of homes from before 1940 holds the grade up; its age pulls it down.
B+
HistoryA character grade: shown, never part of Brookfield’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 Brookfield’s 0.5 sits near the middle of its state (60% of Illinois towns have fewer) while its 1 listings outnumber those of 51% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C+ to A−. The pre-1940 share is a Census survey estimate (±3.7 points). Two sources give 1893.
Founding year: Wikidata (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 Brookfield’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Settlement of the village dates to 1889 when Samuel Eberly Gross, a Chicago lawyer turned real estate investor, began selling building lots plotted from farms and woodlands he had acquired along both sides of the Chicago, Burlington & Quincy Railroad line, which provided passenger and freight service between Chicago and Aurora, Illinois. "Grossdale", as his development was originally called, offered suburban living at prices affordable to working-class families.
In 1893, according to Wikidata. Brookfield’s post office opened in 1892, and the census of 1900 counted 1,111 people here.
How does Brookfield rank for history?
Brookfield is more historic than 67% of U.S. towns, #279 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 Brookfield?
One place: the Grossdale Station (listed 1982).
How old are the homes in Brookfield?
32% of Brookfield’s homes were built before 1940 (Census estimate, ±3.7 points), against a typical 11% for an Illinois town; the median home was built in 1953.
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 Wikimedia Commons (11), Wikidata (1), the National Register of Historic Places (1), Wikipedia, 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.