Glencoe was founded in 1899 with the establishment of the Glenco Post Office on the Eastern Oklahoma Railway. The first lots were sold on April 15, 1900. After J. Hunter Williams, editor of the Glencoe Mirror, was named postmaster on January 4, 1901, he persuaded the U.S. Post Office Department to change the spelling of the town's name to Glencoe. Also that year, Glencoe was reported to be a sundown town, prohibiting African Americans from living or stopping in the town. In its early history Glencoe served as a trading center for the area and agriculture was the mainstay of the local economy. On January 22, 1914, a fire swept through downtown and destroyed most of the business district. While some businesses were rebuilt, the town's future growth was negatively affected by the fire.
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 (6), 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.