Greene County, OH neighbors Clark near Xenia metropolitan centre giving a 2020 estimated population standing at 178,360 making it the 6th most populous county located within Ohio overall. Its county seat is Xenia with other towns include Cedarville & Bellbrook-Xenia itself corresponds out to Greene’s largestcity aside from recognized country seat. This area had been created out of Miami and Franklin Counties back in 1803 when local citizens petitioned for new administrative boundaries - posthumously named after Revolutionary War General Nathaniel Greene leading through period Thomas Jefferson .