28,702 campgrounds
North Cascades National Park
Grand Teton National Park
Guadalupe Mountains National Park
Sequoia National Park
Hot Springs National Park
Glacier National Park
Saguaro National Park
Canyonlands National Park
Isle Royale National Park
Olympic National Park
Haleakala National Park
Great Smoky Mountains National Park
Yellowstone National Park
Yosemite National Park
