State

Florida Keys Overseas Heritage Trail

Florida

Rail Trail

State

Flour Sack Battle Trail

Pennsylvania

Frontcountry Trail

USDA Forest Service

Flume Trail

South Dakota

Backcountry Trail

Nonprofit

Fontenelle Forest Trail

Nebraska

Backcountry Trail

City, Town, or County

Foothills Regional Trail

Washington

Backcountry Trail, Frontcountry Trail, Rail Trail, Urban Trail

USDA Forest Service

Foothills Trail

South Carolina

Backcountry Trail

City, Town, or County

For-Mar Nature Preserve

Michigan

Backcountry Trail

Other Federal

Forest City

Tennessee

USDA Forest Service

Fort Bayard Wood Haul Wagon Road

New Mexico

National Park Service

Fort Circle Parks Trail

District of Columbia

Frontcountry Trail

USDA Forest Service

Fort Henry Hiking Trails

Tennessee

Backcountry Trail

National Park Service

Fort Larned Historic Nature Trail

Kansas

Backcountry Trail

Other Federal

Fort Leavenworth-Gateway

Kansas

Frontcountry Trail

Nonprofit

Fort Mandan Nature and History Trail

North Dakota

Backcountry Trail, Frontcountry Trail

U.S. Fish and Wildlife Service

Fort River Birding and Nature Trail

Massachusetts

Backcountry Trail

City, Town, or County

Fort Worth Nature Center & Refuge

Texas

Frontcountry Trail

National Park Service

Fossil Exhibit Trail

South Dakota

Backcountry Trail

State

Foster's Hammock Loop Trail

Florida

Backcountry Trail

USDA Forest Service

Four C Hiking Trail

Texas

Backcountry Trail

Nonprofit

Fox-Wisconsin Heritage Water Trail

Wisconsin

Water Trail (other)