From a total population of 38,139, Rock Island has a median age of 36.1. The average age of males, in Rock Island, is 34.3 while the average age of females is 37.9. When you compare this to median age of Illinois, Rock Island is 0.9 years younger.
The median income of individuals, in Rock Island, is $22,722 while the average household income is $40,654. When comparing the median income of people living in Rock Island to the rest of Illinois, the average income in Rock Island is $7,297 less.