Canyonlands National Park (extended Canyonlands guide)
Capitol Reef National Park
Carlsbad Caverns National Park
Congaree National Park
Channel Islands National Park
Crater Lake National Park
Cumberland Island National Seashore
Cuyahoga Valley National Park
Death Valley National Park
Denali National Park and Preserve
Dry Tortugas National Park

Other Park Units C-D

Cabrillo National Monument
Canaveral National Seashore
Canyon de Chelly National Monument
Cape Cod National Seashore
Cape Hatteras National Seashore
Cape Lookout National Seashore
Cedar Breaks National Monument
C&O Canal National Historical Park
Colorado National Monument
Craters of the Moon National Monument
Cumberland Gap National Historical Park
Cumberland Island National Seashore
Delaware Water Gap National Recreation Area
Devils Postpile National Monument
Devils Tower National Monument
Dinosaur National Monument