Libertyville is a village in Lake County, Illinois, United States and an affluent suburb of Chicago. It is located 5 miles west of Lake Michigan on the Des Plaines River. The 2014 census population was 20,512. Located in northeastern Illinois, southwest of Waukegan and west of Lake Forest, its immediate neighbors are Mundelein to the west, Green Oaks, Mettawa, and Rondout to the east, Gurnee to the north, Grayslake to the northwest, and Vernon Hills to the south.