Founding year: the first Plano post office (Blevins & Helbock, CC0). Wikidata: 1872.The full story ↓
History grade
What drives Plano’s History grade
On its age, its old homes and the National Register, Plano is more historic than 54% of U.S. towns, #367 of 768 in Illinois. Its National Register listings hold the grade up; its age pulls it down.
B−
HistoryA character grade: shown, never part of Plano’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 Plano’s 4.1 sits above most of its state (73% of Illinois towns have fewer) while its 5 listings outnumber those of 70% 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 is a Census survey estimate (±5.2 points). The founding year is the first post office, not a stated founding date; Wikidata’s 1872 falls in the same era, so the grade doesn’t depend on which one is used.
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 Plano’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
In the early 1860s, the Marsh brothers began producing their Marsh Harvester in Plano. From 1863 to the beginning of the twentieth century the Plano Manufacturing Company, as it became known, provided the foundation for Plano's development. Because of this, Plano High School has adopted the reaper as its mascot.
The Plano post office opened in 1853, the earliest record of the town by name (U.S. post office records). Wikidata gives 1872.
How does Plano rank for history?
Plano is more historic than 54% of U.S. towns, #367 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 Plano?
5 listings: 5 buildings, among them the Albert H. Sears House (listed 1987, the first).
How old are the homes in Plano?
10% of Plano’s homes were built before 1940 (Census estimate, ±5.2 points), against a typical 11% for an Illinois town; the median home was built in 2002.
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 (3), the Library of Congress (11), Wikidata (3), the National Register of Historic Places (5), 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), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.