Post Offices in Sterling, Virginia, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Dulles Post Office No Reviews Favorite Phone: (703) 471-1777Retail Hours Potomac Falls Post Office No Reviews Favorite Fax: (703) 433-1794Phone: (703) 433-2725Retail Hours Sterling Post Office No Reviews Favorite Fax: (703) 421-8714Phone: (703) 444-3163Retail Hours