From a total population of 84,201, Jefferson County has a median age of 38.8. The average age of males, in Jefferson County, is 38.5 while the average age of females is 39.3. When you compare this to median age of Wisconsin, Jefferson County is roughly the same.
The median income of individuals, in Jefferson County, is $26,349 while the average household income is $54,522. When comparing the median income of people living in Jefferson County to the rest of Wisconsin, the average income in Jefferson County is $1,558 less.