Lake County, Illinois

Lake County
County
Lake County Courthouse in Waukegan
Flag Seal
Location within the U.S. state of Illinois
Illinois's location within the U.S.
Coordinates: 42°26′N 87°47′W / 42.43°N 87.78°W / 42.43; -87.78
Country	United States
State	Illinois
Founded	March 1, 1839
Named for	Lake Michigan
Seat	Waukegan
Largest city	Waukegan
Area
• Total	1,368 sq mi (3,540 km2)
• Land	444 sq mi (1,150 km2)
• Water	925 sq mi (2,400 km2)  67.6%
Population  (2020)[1]
• Total	714,342
• Density	520/sq mi (200/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Website	www.lakecountyil.gov

Lake County is a county in northeast Illinois. As of the 2020 census, the population was 714,342.^[1] Some of the main cities are Waukegan and Libertyville.

1. ↑ ^{1.0 1.1} "QuickFacts: Lake County, Illinois". United States Census Bureau. Retrieved August 14, 2023.