From a total population of 19,415, Jacksonville has a median age of 37.4. The average age of males, in Jacksonville, is 34.4 while the average age of females is 41.5. When you compare this to median age of Illinois, Jacksonville is 0.4 years older.
The median income of individuals, in Jacksonville, is $21,382 while the average household income is $39,171. When comparing the median income of people living in Jacksonville to the rest of Illinois, the average income in Jacksonville is $8,637 less.