U.S. Corps of Engineers

Sugar Loaf Mountain Nature Trail

Arkansas

Backcountry Trail

State

Sugar River State Trail

Wisconsin

Rail Trail

USDA Forest Service

Sugarloaf Trail

California

Urban Trail

USDA Forest Service

Sullivan Lake Trail

Washington

Backcountry Trail

City, Town, or County

Summerset Trail

Iowa

Frontcountry Trail, Rail Trail

National Park Service

Summit Nature Trail

Pennsylvania

Backcountry Trail

State

Summit Park Self-Guided Trail

Arkansas

Backcountry Trail

USDA Forest Service

Summit Trail

California

Backcountry Trail

City, Town, or County

Sun Circle Trail

Arizona

Backcountry Trail, Urban Trail

City, Town, or County

Suncoast Trail

Florida

Frontcountry Trail

State

Sunday Gulch Trail

South Dakota

Backcountry Trail

City, Town, or County

Sunrise Carriage Trail

West Virginia

Backcountry Trail

City, Town, or County

Sunset Drive Trail

Alabama

Backcountry Trail, Frontcountry Trail

Nonprofit

Superior Hiking Trail

Minnesota

Backcountry Trail

Nonprofit

Susquehanna River Water Trail - Middle and Lower Sections

Pennsylvania

Water Trail (other)

Nonprofit

Susquehanna River Water Trail - North Branch Section

Pennsylvania

Water Trail (other)

Nonprofit

Susquehanna River Water Trail - West Branch

Pennsylvania

Backcountry Trail, Frontcountry Trail, Water Trail (other)

State

Suwannee River Wilderness Trail

Florida, Georgia

National Water Trail

USDA Forest Service

Swamp Park Trail

Colorado

Backcountry Trail

City, Town, or County

Swan Creek Greenway Trail

Alabama

Backcountry Trail, Frontcountry Trail