From a total population of 11,465, Jefferson County has a median age of 47.6. The average age of males, in Jefferson County, is 47.6 while the average age of females is 47.6. When you compare this to median age of Montana, Jefferson County is 7.8 years older.
The median income of individuals, in Jefferson County, is $30,721 while the average household income is $61,460. When comparing the median income of people living in Jefferson County to the rest of Montana, the average income in Jefferson County is $4,744 more.