Condon was the southern terminus of the Condon Branch of the Union Pacific Railroad. In 1883, a local homesteader named Potter platted the land around a spring on his property. The spring, which emerged from a bed of black basalt, was known to pioneer ranchers in the area as Summit Springs. Experiencing financial difficulty, Potter surrendered the site to the legal firm Condon and Cornish from Arlington. Harvey C. Condon, a member of the firm, was a nephew of Oregon geologist Thomas Condon. Condon and Cornish sold lots in the townsite and in 1884, resident David B. Trimble applied for a post office and became its first postmaster. He named the post office Condon after Harvey C. Condon.
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 (3), Wikidata (3), the National Register of Historic Places (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.