From a total population of 70,597, Johnson County has a median age of 25.9. The average age of males, in Johnson County, is 25.4 while the average age of females is 26.5. When you compare this to median age of Iowa, Johnson County is 12.1 years younger.
The median income of individuals, in Johnson County, is $27,336 while the average household income is $42,119. When comparing the median income of people living in Johnson County to the rest of Iowa, the average income in Johnson County is $285 less.