Libertyville is an affluent northern suburb of Chicago in Lake County, Illinois, United States. It is located 5 miles (8.0km) west of Lake Michigan on the Des Plaines River. The 2000 census population was 20,742; the 2005 estimate was 21,760. (There is also a township of the same name, which includes the village and some surrounding areas.) Located in northeastern Illinois southwest of Waukegan and west by northwest of Lake Forest, its immediate neighbors are Mundelein to the west, Green Oaks and Lake Bluff to the east, Gurnee to the North, Grayslake to the northwest, and Vernon Hills to the south.