On its age, its old homes and the National Register, Knollwood is more historic than 4% of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
D−
HistoryA character grade: shown, never part of Knollwood’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 Knollwood’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.
How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share (±1.9 points) is firm at this size.
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 →
What stands out about Knollwood’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The name "Knollwood" first became associated with the area in the early 20th century. The Chicago North Shore and Milwaukee Railroad stop, located at the intersection of Rockland Road and Telegraph Road (now Waukegan Road), was named "Creamer Corners". To the southwest of the station was a 248-acre (100 ha) property, consisting of two farms, owned by Mrs. Granger Farwell and Mr. A.C. Accord. This property was known as "Knollwood Farm". In 1923, Knollwood Farm was purchased by a group of wealthy Chicago businessmen (including Samuel Insull, Robert P. Lamont, Nathan William MacChesney and Thomas E. Wilson), who wished to turn the land into a country club. The following year, the Knollwood Country Club was founded, and the purchase was finalized in 1925. The community that sprang up around the club came to be known as Knollwood.
Knollwood is more historic than 4% of U.S. towns. 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 Knollwood?
0.0% of Knollwood’s homes were built before 1940 (Census estimate, ±1.9 points), against a typical 11% for an Illinois town; the median home was built in 1970.
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 (6), Wikipedia and U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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