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What to do and see in Crystal Lake, Illinois (IL): The Best Fun Activities & Games

Crystal Lake is a city in McHenry County in the U.S. state of Illinois. Named after a lake 1.6 miles (2.6 km) southwest of the city's downtown, Crystal Lake is 45 miles northwest of Chicago. The population was 40,743 in 2010. Crystal Lake is the largest city in McHenry County, part of the Chicago metropolitan area.