From a total population of 7,520, Marengo has a median age of 36.1. The average age of males, in Marengo, is 35.4 while the average age of females is 36.5. When you compare this to median age of Illinois, Marengo is 0.9 years younger.
The median income of individuals, in Marengo, is $23,959 while the average household income is $57,612. When comparing the median income of people living in Marengo to the rest of Illinois, the average income in Marengo is $6,060 less.