Peketon County, now extinct, was created by the act of Feb. 21, 1860, which provided that "all territory west of the 6th principal meridian, and south of township 16, in Kansas Territory, be erected into a county, to be known by the name of Peketon county." The northeast corner of Peketon county was identical with the northeast corner of the present county of McPherson, from which point straight lines ran west and south to the territorial boundaries, hence the county embraced considerably over one-fourth of the present State of Kansas. The temporary seat of justice of the county was located at Beach Valley. Ashel Beach, A. C. Beach and Samuel Shaff were appointed commissioners to divide the county into election precincts and make arrangements for the first election, which was to be held at the time of the regular spring election in March, 1860.

The only mention of Peketon county in any of the documents in the archives of the Kansas Historical Society, is a letter from John F. Dodds to Samuel Wood, dated "Kiowa, Peketon county, Kansas, May 10, 1864." In 1867 Marion county was enlarged to include Peketon, which then disappeared.