28,389 campgrounds
Cimarron National Grassland
Tongass National Forest
Okanogan-Wenatchee National Forest
Tonto National Forest
Sitgreaves National Forest
Okanogan National Forest
Humboldt National Forest
Shasta-Trinity National Forest
Deschutes National Forest
Tahoe National Forest
Clearwater National Forest
Plumas National Forest
Mt. Hood National Forest
Jefferson National Forest
Deerlodge National Forest
Trinity National Forest
Roosevelt National Forest
Gallatin National Forest
Nezperce National Forest
Pike National Forest
