The Fossil post office was established on February 28, 1876, on Thomas Benton Hoover's ranch along Hoover Creek. He named the place Fossil after finding fossils in a clay-like rock formation on his ranch. In 1881, Hoover and Thomas Watson opened a store near the confluence of Butte and Cottonwood creeks and moved the post office to the store. When the city was incorporated in 1891, Hoover became the first mayor.
After creating Wheeler County in 1899, the Oregon Legislature chose Fossil as the temporary county seat. A county-wide election held in 1900 to determine the permanent county seat yielded 436 votes for Fossil, 267 for Twickenham, and 82 for Spray.
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 (2), Wikidata (1), the National Register of Historic Places (2), Wikipedia, 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.