Rooks County (standard abbreviation: RO) is a county located in the U.S. state of Kansas. Its county seat is Stockton, and its largest city is Plainville. As of the 2020 census, the county population was 4,919. The county was named for John Rooks, a private in Company I of the 11th Kansas Cavalry Regiment, who died at the Battle of Prairie Grove during the American Civil War.
