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As of the 2010 United States Census, Collinsville, located in the Prairie State, had a total population of 25,960 people.
From a total population of 25,960, Collinsville has a median age of 36.7. The average age of males, in Collinsville, is 35.8 while the average age of females is 37.4. When you compare this to median age of Illinois, Collinsville is 0.3 years younger.
The median income of individuals, in Collinsville, is $27,041 while the average household income is $52,821. When comparing the median income of people living in Collinsville to the rest of Illinois, the average income in Collinsville is $2,978 less.