Day County was one of the original counties of Oklahoma Territory. Day County was in the western part of the territory, along the Texas border. When it was originally established in 1890, it was known as E County (several Oklahoma counties carried only letter designations at the time). It was later named for Charles Day, the contractor who built the first courthouse in the county seat, the now-defunct town of Ioland, Oklahoma.[a]
- ^ "Ioland (historical) in Ellis County, Oklahoma" OK Hometown Locator Accessed July 2, 2015.
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