|Lake County Illinois Cities/Towns - Antioch, Barrington, Barrington Hills, Bannockburn, Beach Park, Buffalo Grove, Channel Lake, Deerfield, Deer Park, Forest Lake, Fox Lake, Fox Lake Hills, Fox River Grove, Gages Lake, Grandwood Park, Grayslake, Green Oaks, Gurnee, Hainesville, Hawthorn Woods, Highland Park, Highwood, Indian Creek, Island Lake, Kildeer, Lake Barrington, Lake Bluff, Lake Catherine, Lake Forest, Lake Villa, Lake Zurich, Lakemoor, Libertyville, Lincolnshire, Lindenhurst, Long Grove, Long Lake, Mettawa, Mundelein, North Barrington, North Chicago, Old Mill Creek, Park City, Port Barrington, Riverwoods, Round Lake, Round Lake Beach, Round Lake Heights, Round Lake Park, Third Lake, Tower Lakes, Venetian Village, Vernon Hills, Volo, Wadsworth, Wauconda, Waukegan (County Seat), Winthrop Harbor, Zion
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Lake County is a county in the U.S. state of Illinois. A 2016 census estimated the population was 703,047. Its county seat is Waukegan.
Lake County was created in 1839.