28,702 campgrounds
Big Bend National Park
Olympic National Park
Biscayne National Park
Joshua Tree National Park
Yosemite National Park
Yellowstone National Park
Upper Delaware Scenic & Recreational River
Mount Rainier National Park
Everglades National Park
Buffalo National River
Ozark National Scenic Riverways
Grand Canyon National Park
Wrangell-St. Elias National Park and Preserve
Great Smoky Mountains National Park
