From a total population of 220,558, Jefferson County has a median age of 38.4. The average age of males, in Jefferson County, is 37.5 while the average age of females is 39.3. When you compare this to median age of Missouri, Jefferson County is 0.3 years older.
The median income of individuals, in Jefferson County, is $25,034 while the average household income is $55,563. When comparing the median income of people living in Jefferson County to the rest of Missouri, the average income in Jefferson County is $972 less.