The Cobden post office opened in 1873, the earliest record of the town by name. Another post office, South Pass (1858), opened inside today’s town and later closed.
First census: 800 in 18802020 census: 1,074153 years
How historic is Cobden?
B−
More historic than 46% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Cobden post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Cobden’s History grade
On its age, its old homes and the National Register, Cobden is more historic than 46% of U.S. towns. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
B−
HistoryA character grade: shown, never part of Cobden’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 Cobden’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 any two of the three inputs instead, the letter would range from C− to B. The pre-1940 share is a Census survey estimate (±6.0 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 Cobden’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.
The village is named after British politician Richard Cobden, who visited the town in 1859. An early variant name was "South Pass".
Cobden began as an agricultural town and developed around the tracks of a route owned by the Illinois Central Railroad (now owned by Canadian National Railway), as well as being along a main highway, U.S. Highway 51, running through the region.
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.
Lost post offices, old corners and burying grounds
Cobden’s post office has been open since 1873. Another post office, South Pass, opened and closed inside today’s town.
South Pass
1858–1873
Cobden
1873–today
18501940today
Hamlets and corners on the map
Mason
1cemetery inside Cobden
Saint Joseph
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Questions about Cobden’s history
What year was Cobden founded?
The Cobden post office opened in 1873, the earliest record of the town by name (U.S. post office records).
How does Cobden rank for history?
Cobden is more historic than 46% 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 Cobden?
26% of Cobden’s homes were built before 1940 (Census estimate, ±6.0 points), against a typical 11% for an Illinois town; the median home was built in 1963.
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), 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.
1941
2021
