National Park Service Class I Areas

1. Acadia National Park (ME)
2. Arches National Park (UT)
3. Badlands National Park (SD)
4. Bandelier National Monument (NM)
5. Big Bend National Park (TX)
6. Black Canyon of the Gunnison National Park (CO)
7. Bryce Canyon National Park (UT)
8. Canyonlands National Park (UT)
9. Capitol Reef National Park (UT)
10. Carlsbad Caverns National Park (NM)
11. Chiricahua National Monument (AZ)
12. Crater Lake National Park (OR)
13. Craters of the Moon National Monument (ID)
14. Denali National Park and Preserve (AK)
15. Everglades National Park (FL)
16. Glacier National Park (MT)
17. Grand Canyon National Park (AZ)
18. Grand Teton National Park (WY)
19. Great Sand Dunes National Monument (CO)
20. Great Smoky Mountains National Park (TN/NC)
21. Guadalupe Mountains National Park (TX)
22. Haleakala National Park (HI)
23. Hawaii Volcanoes National Park (HI)
24. Isle Royal National Park (MI)
25. Joshua Tree National Park (CA)
26. Kings Canyon National Park (CA)
27. Lassen Volcanic National Park (CA)
28. Lava Beds National Monument (CA)
29. Mammoth Cave National Park (KY)
30. Mesa Verde National Park (CO)
31. Mount Rainier National Park (WA)
32. North Cascades National Park (WA)
33. Olympic National Park (WA)
34. Petrified Forest National Park (AZ)
35. Pinnacles National Monument (CA)
36. Point Reyes National Seashore (CA)
37. Redwood National Park (CA)
38. Rocky Mountain National Park (CO)
39. Roosevelt Campobello International Park (ME/CANADA) (jointly administered by the USA and Canada)
40. Saguaro National Park (AZ)
41. Sequoia National Park (CA)
42. Shenandoah National Park (VA)
43. Theodore Roosevelt National Park (ND)
44. Virgin Islands National Park (VI)
45. Voyageurs National Park (MN)
46. Wind Cave National Park (SD)
47. Yellowstone National Park (WY/MT/ID)
48. Yosemite National Park (CA)
49. Zion National Park (UT)