20. Great Falls, Virginia (Average Household Income: $311,915)

Located west of McLean (number 30 on this list) Great Falls is the richest suburb in Washington D.C. Some powerful Great Falls residents include political elites like former Senator Rick Santorum and Washington Redskins Owner Dan Snyder.

Great Falls sits against the Potomac River, which separates Virginia from Maryland. There are some beautiful overlooks of the waterfalls on the eastern side of the town, which makes sense given the name of the town.