City, Town, or County

Piney Knob Trail System

North Carolina

Backcountry Trail

Private

Piney River Nature Trail

Tennessee

Backcountry Trail

USDA Forest Service

Pinhoti Trails System

Alabama

Backcountry Trail

Bureau of Land Management

Pinnell Mountain Trail

Alaska

Backcountry Trail

USDA Forest Service

Pioneer Loop Trail

Montana

Backcountry Trail

U.S. Corps of Engineers

Pioneer Nature Trail

Kansas

Backcountry Trail

USDA Forest Service

Pioneer Trail

California

Private

Pittsburgh-to-Harrisburg Main Line Canal Greenway

Pennsylvania

Backcountry Trail, Frontcountry Trail

State

Platte River Greenway Trail

Colorado

Frontcountry Trail

City, Town, or County

Pleasant Run Trail

Indiana

State

Pomeroy and Newark Rail Trail

Delaware

Backcountry Trail, Rail Trail, Urban Trail

U.S. Corps of Engineers

Pomme de Terre Multipurpose Trail

Missouri

Backcountry Trail

USDA Forest Service

Pony Express Trail

California

Backcountry Trail

USDA Forest Service

Pope-Baldwin Bicycle Trail

California

Urban Trail

State

Port Royal Sound Adventure Trail

South Carolina

Water Trail (other)

State

Post Oak Nature Trail

Kansas

Backcountry Trail

USDA Forest Service

Potawatomi-Gorge Falls Trail

Michigan

Backcountry Trail

State

Potomac River Water Trail

District of Columbia, Maryland, Virginia, West Virginia

Frontcountry Trail, Water Trail (other)

Nonprofit

Poudre River Trail Corridor

Colorado

Backcountry Trail, Urban Trail

City, Town, or County

Prairie Creek Greenway

Missouri

Frontcountry Trail, Urban Trail