- Great Falls Located between the banks of the beautiful Potomac River on the North, Route 7 (Leesburg Pike) on the South, Loudoun County on the West and McLean on the East, Great Falls is some of the most beautiful real estate in the entire area. Great Falls is a location. Great Falls is a place to live. Great Falls is a state of mind. Only Potomac on the Maryland side of the Potomac River rivals ...www.greatfallsvirginiarealestateguide.com