24,765 campgrounds
Mount Rainier National Park
Guadalupe Mountains National Park
Big Bend National Park
Great Smoky Mountains National Park
Grand Teton National Park
Buffalo National River
Isle Royale National Park
Redwood National and State Parks
North Cascades National Park
Rocky Mountain National Park
Everglades National Park
Ozark National Scenic Riverways
Haleakala National Park
Sequoia National Park
Yellowstone National Park
Yosemite National Park