From a total population of 37,952, Clinton County has a median age of 40.1. The average age of males, in Clinton County, is 38.6 while the average age of females is 41.9. When you compare this to median age of Illinois, Clinton County is 3.1 years older.
The median income of individuals, in Clinton County, is $28,255 while the average household income is $62,407. When comparing the median income of people living in Clinton County to the rest of Illinois, the average income in Clinton County is $1,764 less.