Waukegan (), officially the City of Waukegan, is the most populous city in, and the county seat of Lake County, Illinois, United States. The city is located within the Chicago metropolitan area, situated approximately 29 miles (47 km) north of Chicago’s North Side along the shores of Lake Michigan. As of the 2020 census, the population of the city was 89,321, ranking it the tenth most populous city in Illinois and the 390th most populous city in the country. Waukegan has a significant working-class population, as well as some poor areas within the city. Additionally, there is also a moderately sized middle-class community that exists within the city.