From a total population of 19,022, Cook County has a median age of 38.2. The average age of males, in Cook County, is 38.8 while the average age of females is 37.8. When you compare this to median age of Illinois, Cook County is 1.2 years older.
The median income of individuals, in Cook County, is $33,584 while the average household income is $76,735. When comparing the median income of people living in Cook County to the rest of Illinois, the average income in Cook County is $3,565 more.