The Duncan post office opened in 1880, the earliest record of the town by name. Another post office, Cherry Hill (1869), opened inside today’s town and later closed.
First census: 182 in 19202020 census: 392146 years
Founding year: the first Duncan post office (Blevins & Helbock, CC0).The full story ↓
What stands out about Duncan’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The transcontinental railroad reached the site of Duncan in 1866. Among the first settlers in the area were Polish and Swiss immigrants.
In June 1869, the post office of Cherry Hill was established on the site.
In October 1871, the townsite of Jackson was laid out by officials of the Union Pacific Railroad. Jackson was chosen in 1879 as the southern terminus of the Omaha, Niobrara, and Black Hills Railroad, a Union Pacific subsidiary, purportedly because railroad magnate Jay Gould was angry at the town of Columbus for promoting a rival railroad in the region.
The new name honored General Wood B. Duncan, a prominent onetime local resident.
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). How TownRatings grades history →
From Wikimedia Commons (7), the Library of Congress (1), the National Register of Historic Places (1), 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.