28,702 campgrounds
Big Bend National Park
Kings Canyon National Park
Upper Delaware Scenic & Recreational River
Olympic National Park
Everglades National Park
Glacier National Park
Ozark National Scenic Riverways
Mount Rainier National Park
Guadalupe Mountains National Park
Great Smoky Mountains National Park
Grand Teton National Park
Buffalo National River
Isle Royale National Park
Redwood National and State Parks
North Cascades National Park
