From a total population of 17,981, Frankfort has a median age of 40.8. The average age of males, in Frankfort, is 40.4 while the average age of females is 41.4. When you compare this to median age of Illinois, Frankfort is 3.8 years older.
The median income of individuals, in Frankfort, is $41,832 while the average household income is $110,829. When comparing the median income of people living in Frankfort to the rest of Illinois, the average income in Frankfort is $11,813 more.