What county is Waukegan IL in

Waukegan city is located Lake County.

Waukegan is a city in Lake County, Illinois, United States. At the 2010 Census,the population was 89,078 and the population density was 1,440.13 per km2. It is the ninth largest city in Illinois by population.

What county is Waukegan IL 60085?
What county is North Chicago?

What is considered Lake County?