29,278 campgrounds
Great Smoky Mountains National Park
Great Basin National Park
Olympic National Park
Sequoia National Park
Isle Royale National Park
Buffalo National River
Black Canyon of the Gunnison National Park
Lassen Volcanic National Park
Death Valley National Park
Yosemite National Park
Kings Canyon National Park
Canyonlands National Park
Zion National Park
Everglades National Park
