- Arapahoe was never officially organized, but it did have official records used in conjunction with the name.
- Defined by the creating statute as "Commencing at the intersection of the east line of range 31, west, with the north line of township 27, south; thence south along the range line to where it intersects the sixth standard parallel; thence west along the sixth standard parallel to the intersection with the east line of range 35, west; thence north along the range line to where it intersects the north line of township 27, south; thence east to the place of beginning."
- In 1883, Arapahoe was merged into an expanded Finney County; in 1887, when Finney was broken up, that part which had been Arapahoe was created as Haskell County. The county was never organized, and no county seat is known to have existed. - Kansas State Historical Society: Arapahoe County, Kansas (2nd)
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