McLean County was formed by an act of the Kentucky legislature on February 6, 1854, from portions of surrounding Daviess, Ohio, and Muhlenburg counties. The county was named after Judge Alney McLean who founded Greenville which is the county seat of Muhlenberg County. The county is seat to the city of Calhoun, KY located on the western side of the state. with over 9,500 residents calling the county home, it has a total area of 256 sqaure miles.