Founding year: the first Lannon post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Lannon’s History grade
On its age, its old homes and the National Register, Lannon is more historic than 34% of U.S. towns. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
C
HistoryA character grade: shown, never part of Lannon’s overall grade.
Wisconsin towns list more on the Register than most of the country (a typical Wisconsin town has 3.0 per 10,000 residents, the U.S. 2.4), so Lannon’s 0.0 sits below most of its state (28% of Wisconsin towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C− to C+. The pre-1940 share is a Census survey estimate (±9.7 points). 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 Lannon’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The village is named for William Lannon, who settled here with his bride in 1834. The area was granted the postal designation of "Lannon" in 1890. In 1930 the Village of Lannon was incorporated out of parts of the Town of Menomonee.
Lannon stone, a type of limestone or dolomite, is named for the town, as it was quarried here. John Halquist built one of the state's largest stone companies from Lannon stone first in Sussex, Wisconsin, and then in several locations.
Lannon stone was the major source of stone for many cities in Wisconsin and for Chicago. It was widely used to provide a stone veneer on bridges.
The Lannon post office opened in 1890, the earliest record of the town by name (U.S. post office records).
How does Lannon rank for history?
Lannon is more historic than 34% 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 Lannon?
14% of Lannon’s homes were built before 1940 (Census estimate, ±9.7 points), against a typical 12% for a Wisconsin town; the median home was built in 1995.
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 Wikipedia, 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.
