McLean County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 9,152. Its county seat is Calhoun and its largest city is Livermore. McLean is a prohibition or dry county. McLean County is part of the Owensboro, KY Metropolitan Statistical Area, which has a population of some 114,752.

Livermore is a home rule-class city located at the confluence of the Green and Rough rivers in McLean County in the U.S. state of Kentucky. The population was 1,230 as of the 2020 census, down from 1,365 in 2010. It is included in the Owensboro metropolitan area.