State

South Cumberland Trail System

Tennessee

Frontcountry Trail

USDA Forest Service

South Fork of Trinity River NRT

California

Backcountry Trail

National Park Service

South Kaibab Trail

Arizona

Backcountry Trail

USDA Forest Service

South Kelsey Trail

California

Backcountry Trail

City, Town, or County

South Mountain Park Trails

Arizona

Frontcountry Trail

National Park Service

South Rim

Wyoming

Backcountry Trail

Bureau of Land Management

South Yuba Trail

California

Backcountry Trail

Nonprofit

Southern New England Trunk Line

Massachusetts

USDA Forest Service

Spencer Meadow

California

Backcountry Trail

State

Spirit Mound Summit Trail

South Dakota

State

Spokane River Centennial Trail

Washington

Backcountry Trail, Frontcountry Trail, Rail Trail, Urban Trail

City, Town, or County

Sportsman Lake Trails

Alabama

Backcountry Trail

National Park Service

Spotsylvania Battlefield

Virginia

Backcountry Trail

City, Town, or County

Springbrook Prairie Trail

Illinois

U.S. Corps of Engineers

Springhill Mountain Bike Trail

Arkansas

Backcountry Trail

U.S. Corps of Engineers

Spyglass Hill Trail

Mississippi

Backcountry Trail

Nonprofit

St. Louis River Estuary Water Trail

Minnesota, Wisconsin

National Water Trail

U.S. Fish and Wildlife Service

St. Paul Island High Bluffs Trail

Alaska

Backcountry Trail

City, Town, or County

Stanbery Creek

Ohio

National Park Service

Staple Bend Tunnel Trail

Pennsylvania

Backcountry Trail, Frontcountry Trail, Rail Trail, Urban Trail