28,678 campgrounds
San Bernardino National Forest
San Juan National Forest
Stanislaus National Forest
Willamette National Forest
Medicine Bow National Forest
Chattahoochee National Forest
Francis Marion National Forest
Klamath National Forest
Little Missouri National Grassland
Bridger-Teton National Forest
Snoqualmie National Forest
Wenatchee National Forest
Modoc National Forest
Tahoe National Forest
Manistee National Forest
Sumter National Forest
Pike National Forest
Ozark National Forest
Nezperce National Forest
Kaniksu National Forest
