28,702 campgrounds
Rocky Mountain National Park
Isle Royale National Park
Grand Canyon National Park
Grand Teton National Park
Great Smoky Mountains National Park
Yosemite National Park
Big Bend National Park
North Cascades National Park
Death Valley National Park
Kings Canyon National Park
Great Basin National Park
Canyonlands National Park
White Sands National Park
Mount Rainier National Park
Bryce Canyon National Park
Zion National Park
