30,722 campgrounds
Isle Royale National Park
Olympic National Park
Canyonlands National Park
Mount Rainier National Park
Hawaii Volcanoes National Park
New River Gorge National Park and Preserve
Yellowstone National Park
Bryce Canyon National Park
Yosemite National Park
Black Canyon of the Gunnison National Park
Ozark National Scenic Riverways
Death Valley National Park
North Cascades National Park
Shenandoah National Park
Grand Canyon National Park
Grand Teton National Park
Everglades National Park
Great Basin National Park
