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As of the 2010 United States Census, Saint Clair County, located in the Prairie State, had a total population of 12,706 people.
From a total population of 12,706, Saint Clair County has a median age of 37.9. The average age of males, in Saint Clair County, is 34.7 while the average age of females is 40.7. When you compare this to median age of Illinois, Saint Clair County is 0.9 years older.
The median income of individuals, in Saint Clair County, is $36,546 while the average household income is $81,731. When comparing the median income of people living in Saint Clair County to the rest of Illinois, the average income in Saint Clair County is $6,527 more.