The Ong post office opened in 1886, the earliest record of the town by name. Two smaller post offices, Greenbury (1886) and Joong (1886), opened inside today’s town and later closed.
First census: 285 in 19102020 census: 49140 years
How did Ong get its name?
Ong was named for Judge Joseph Eli Ong (1845-1912), the original owner of the town site.
Ong was platted in 1886 when the Burlington and Missouri River Railroad was extended to that point. It was named for Judge Joseph Eli Ong (1845-1912), the original owner of the town site.
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), 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) 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.