From a total population of 26,620, Jefferson County has a median age of 30.8. The average age of males, in Jefferson County, is 30.7 while the average age of females is 30.9. When you compare this to median age of Idaho, Jefferson County is 4.4 years younger.
The median income of individuals, in Jefferson County, is $19,515 while the average household income is $52,495. When comparing the median income of people living in Jefferson County to the rest of Idaho, the average income in Jefferson County is $3,572 less.