28,702 campgrounds
Joshua Tree National Park
Yellowstone National Park
Isle Royale 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
Hawaii Volcanoes National Park
Olympic National Park
Katmai National Park and Preserve
