29,332 campgrounds
Yellowstone National Park
Haleakala National Park
Yosemite National Park
Isle Royale National Park
Great Smoky Mountains National Park
Joshua Tree National Park
Mount Rainier National Park
Canyonlands National Park
Redwood National and State Parks
Grand Teton National Park
North Cascades National Park
Wrangell-St. Elias National Park and Preserve
Zion National Park
Theodore Roosevelt National Park
Big Bend National Park
Lassen Volcanic National Park
