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As of the 2010 United States Census, Crystal Lake, located in the Prairie State, had a total population of 41,797 people.
From a total population of 41,797, Crystal Lake has a median age of 37.6. The average age of males, in Crystal Lake, is 36 while the average age of females is 39.2. When you compare this to median age of Illinois, Crystal Lake is 0.6 years older.
The median income of individuals, in Crystal Lake, is $34,041 while the average household income is $80,136. When comparing the median income of people living in Crystal Lake to the rest of Illinois, the average income in Crystal Lake is $4,022 more.