25,645 campgrounds
Wind Cave National Park
Redwood National and State Parks
Biscayne National Park
Death Valley National Park
Buffalo National River
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
Dry Tortugas National Park
Yosemite National Park
Canyonlands National Park
Grand Teton National Park
