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Crystal Lake is a city in McHenry County in the U.S. state of Illinois. Named after a lake 1.6 mi southwest of the city's downtown, Crystal Lake is 45 miles northwest of Chicago. The population is 40,269 as of the 2020 Census, a 1.2% decrease from 2010. Crystal Lake is the largest city in McHenry County, part of the Chicago metropolitan area.
