Crystal Lake is a city in McHenry County, Illinois, United States. Named after a lake 1.6 miles southwest of the city's downtown, Crystal Lake is 45 miles northwest of Chicago. The population was 40,269 as of the 2020 census. Crystal Lake is the most populous city in McHenry County, part of the Chicago metropolitan area.
AdFind discounts on the best Crystal Lake Il. Tripadvisor helps you spend less. Save money & book with Tripadvisor, the world's largest travel website.