From a total population of 50,173, Grundy County has a median age of 36.8. The average age of males, in Grundy County, is 36.1 while the average age of females is 37.8. When you compare this to median age of Illinois, Grundy County is 0.2 years younger.
The median income of individuals, in Grundy County, is $29,439 while the average household income is $65,197. When comparing the median income of people living in Grundy County to the rest of Illinois, the average income in Grundy County is $580 less.