28,702 campgrounds
Death Valley National Park
Big Bend National Park
Kenai Fjords National Park
Isle Royale National Park
Mount Rainier National Park
North Cascades National Park
Yellowstone National Park
Everglades National Park
Redwood National and State Parks
Dry Tortugas National Park
Yosemite National Park
Canyonlands National Park
Grand Teton National Park
New River Gorge National Park and Preserve
Olympic National Park
