USDA Forest Service

North Umpqua Trail - Maidu Lake Segment

Oregon

Backcountry Trail

USDA Forest Service

North Umpqua Trail - Mott Section

Oregon

Backcountry Trail, Frontcountry Trail

Bureau of Land Management

North Umpqua Trail - Tioga Segment

Oregon

Backcountry Trail

State

North Western State Trail

Michigan

Rail Trail

State

Northern Delaware Greenway Trail - Brandywine Creek

Delaware

Backcountry Trail

State

Northern Delaware Greenway Trail - Wilmington

Delaware

Backcountry Trail, Urban Trail

Private

Northfield Mountain Trail System

Massachusetts

Backcountry Trail

U.S. Corps of Engineers

Northshore Trail

Texas

Backcountry Trail

City, Town, or County

Northwest Greenway Trail

Indiana

Urban Trail

City, Town, or County

Oak Creek Trail

Nebraska

Rail Trail

City, Town, or County

Oak Leaf Trail - Lake Loop

Wisconsin

Urban Trail

City, Town, or County

Oak Leaf Trail - Warnimont Park

Wisconsin

Urban Trail

State

Oak Mountain Red Trail

Alabama

Backcountry Trail

City, Town, or County

Oakdale Park Nature Trail

Minnesota

Backcountry Trail

U.S. Fish and Wildlife Service

Oaks to Wetlands Trail

Washington

U.S. Corps of Engineers

Obey River Canoe Trail

Tennessee

Water Trail (other)

USDA Forest Service

Observatory Trail

California

Backcountry Trail

USDA Forest Service

Ocala Trail

Florida

Backcountry Trail

State

Occoquan Water Trail

Virginia

Frontcountry Trail, Water Trail (other)

National Park Service

Ohio & Erie Canal Towpath Trail

Ohio

Backcountry Trail, Frontcountry Trail, Urban Trail