As of mid-2009, the Potomac Heritage National Scenic Trail network includes approximately 830 miles of existing and planned trails and trail corridors managed by different agencies and organizations:

• the 70-mile Laurel Highlands Hiking Trail, within Laurel Ridge State Park
• the 150-mile Great Allegheny Passage (connecting Cumberland, MD, and Pittsburgh, PA), a system of seven trails managed by an alliance of organizations and agencies
• the 184.5-mile Chesapeake and Ohio Canal Towpath within Chesapeake and Ohio National Historical Park
• a 15-mile linear park system in Loudoun County, VA
• 7.7 miles of trails within Riverbend Park, Great Falls Park and Scott’s Run Nature Preserve in northern Fairfax County, VA
• two partially-completed routes within the District of Columbia—the 23-mile Fort Circle Parks Trail, part of the Civil War Defenses of Washington, and a multi-use route between Georgetown and Oxon Cove Park
• the 18.5-mile Mount Vernon Trail and the 10-mile Potomac Heritage Trail within George Washington Memorial Parkway
• a 27-mile Potomac Heritage Trail On-Road Bicycling Route in Prince Georges County, MD
• a one-mile trail along the north shore of Piscataway Creek in Piscataway Park
• a two-mile route within Nanjemoy Natural Resource Management Area, Charles County, MD
• the Southern Maryland Potomac Heritage Trail Bicycling Route in Charles and St. Mary’s counties
• two 4.5-mile routes in Prince William Forest Park and a partially-completed 8-mile route, between Leesylvania State Park and Belmont Bay, in Prince William County
• the 23-mile Alexandria Heritage Trail in Alexandria, VA
• the Government Island Trail, the planned five-mile Historic Falmouth-Ferry Farm Trail, and the Aquia Creek Water Trail in Stafford County, VA
• the Northern Neck Heritage Trail Bicycling Route Network in the four-county area of Westmoreland, Northumberland, Lancaster and Richmond (Virginia)