Waukegan, is the most populous city in and the county seat of Lake County, Illinois, United States. An industrial suburb of Chicago, Waukegan is situated about 26 miles north of Chicago’s city limits. As of the 2020 census, its population was 89,321, ranking it the seventh-most populous city within the Chicago metropolitan area, and the 10th-most populous city in Illinois. Waukegan has a significant working-class population, some poor areas and a small middle-class community.