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.
According to the 2010 census, Crystal Lake has a total area of 18.957 square miles (49.10 km²), of which 18.35 square miles (47.53 km²) (or 96.8%) is land and 0.607 square miles (1.57 km²) (or 3.2%) is water.
As of the 2010 Census, there were 40,743 people, 14,421 households, and 10,551 families living in the city. The population density was 2,220/sq mi (857/km²). There were 15,176 total housing units and 22% of all housing units were in multi-unit structures. The racial makeup of the city was 90.2% White, 1.0% Black or African American, 0.4% Native American, 2.5% Asian, 0.01% Pacific Islander, 4.1% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 11.7% of the population.
39.2% of the households included children under 18, 58.9% were married couples living together, 10.1% had a female householder with no husband present, and 26.8% were non-families. 22.1% of all households were made up of individuals living alone and 20.3% had someone at least 65 years old living alone. The average household size was 2.81 and the average family size was 3.31.
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