From a total population of 9,813, Waterloo has a median age of 41.7. The average age of males, in Waterloo, is 39.4 while the average age of females is 43.2. When you compare this to median age of Illinois, Waterloo is 4.7 years older.
The median income of individuals, in Waterloo, is $33,059 while the average household income is $69,592. When comparing the median income of people living in Waterloo to the rest of Illinois, the average income in Waterloo is $3,040 more.