Libertyville is a municipality in Lake County, Illinois, United States, and a northern suburb of Chicago. It is located 5 miles west of Lake Michigan on the Des Plaines River. The 2010 census population was 20,315. It is part of Libertyville Township, which includes the village, neighboring Green Oaks, and portions of Vernon Hills, Mundelein, and unincorporated Waukegan and Lake Forest. Libertyville neighbors these villages as well as Gurnee to the north and Grayslake to the northwest. Libertyville is about 40 miles north of the Chicago Loop and is part of the United States Census Bureau's Chicago combined statistical area.