Each edition grades its towns against each other only.
More historic than 9% of U.S. towns · #731 of 768 in Illinois. What drives it
Most of Round Lake Heights was built recently: 5% of its homes predate 1940 and the median home dates from 1990. Below: maps from 1920 on and the census since 1970.
Round Lake Heights first appears in the census in 1970.
More historic than 9% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Round Lake Heights is more historic than 9% of U.S. towns, #731 of 768 in Illinois. Its share of homes from before 1940 holds the grade up; its age pulls it down.
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 Round Lake Heights’ 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.
Founding year: the first census (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 →
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 Round Lake Heights’s history is told.
Every edition of the U.S. Geological Survey’s map of Round Lake Heights. 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 Round Lake Heights.
Wikipedia doesn’t have a history of Round Lake Heights yet. The photos, dates and memories neighbors add here are how it gets written.
Round Lake Heights is a village in Lake County, Illinois, United States. Per the 2020 census, the population was 2,622.
Its first post office opened in 1970. Between the 2010 and 2020 censuses its population fell from 2,676 to 2,622 (-2%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Between 1,144 and 2,676 people in every census since 1970.
6 censuses, 1970–2020.
U.S. Census Bureau decennial counts, from the census table on Round Lake Heights’ Wikipedia page.
Nobody well known was born in Round Lake Heights itself, so here are the best known from just nearby.
Each neighbor’s History grade, on the same three inputs.
The Round Lake Heights post office opened in 1970, the earliest record of the town by name (U.S. post office records).
Round Lake Heights is more historic than 9% of U.S. towns, #731 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.
5% of Round Lake Heights’ homes were built before 1940 (Census estimate, ±5.1 points), against a typical 11% for an Illinois town; the median home was built in 1990.
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).
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.
