From a total population of 1,117,072, Fairfax County has a median age of 37.4. The average age of males, in Fairfax County, is 36.4 while the average age of females is 38.3. When you compare this to median age of Virginia, Fairfax County is 0.2 years younger.
The median income of individuals, in Fairfax County, is $51,137 while the average household income is $112,102. When comparing the median income of people living in Fairfax County to the rest of Virginia, the average income in Fairfax County is $17,179 more.