1. Great Smoky Mountains National Park

10,099,276

2. Grand Canyon National Park

4,756,771

3. Yosemite National Park

3,882,642

4. Yellowstone National Park

3,513,484

5. Rocky Mountain National Park

3,434,751

6. Olympic National Park

3,243,872

7. Zion National Park

3,189,696

8. Grand Teton National Park

2,791,392

9. Acadia National Park

2,563,129

10. Glacier National Park

2,338,528

11. Cuyahoga Valley National Park

2,189,849

12. Hawaii Volcanoes National Park

1,693,005

13. Joshua Tree National Park

1,589,904

14. Bryce Canyon National Park

1,435,741

15. Hot Springs National Park

1,424,484

16. Arches National Park

1,284,767

17. Mount Rainier National Park

1,264,259

18. Shenandoah National Park

1,255,321

19. Haleakala National Park

1,142,040

20. Everglades National Park

1,110,901

21. Death Valley National Park

1,101,312

22. Sequoia National Park

1,039,137

23. Badlands National Park

868,094

24. Petrified Forest National Park

836,799

25. Capitol Reef National Park

786,514

26. Saguaro Forest National Park

673,572

27. Theodore Roosevelt National Park

559,580

28. Wind Cave National Park

547,022

29. Canyonlands National Park

542,431

30. Crater Lake National Park

535,508

31. Denali National Park

531,315

32. Biscayne National Park

525,745

33. Mammoth Cave National Park

522,628

34. Kings Canyon National Park

502,268

35. Mesa Verde National Park

501,563

36. Glacier Bay National Park

500,727

37. Lassen Volcanic National Park

432,977

38. Redwood National Park

429,166

39. Virgin Islands National Park

426,930

40. Carlsbad Caverns National Park

397,309

41. Channel Islands National Park

342,161

42. Big Bend National Park

314,102

43. Great Sand Dunes National Park

271,774

44. Kenai Fjords National Park

270,666

45. Voyageurs National Park

239,160

46. Pinnacles National Park

196,635

47. Black Canyon of the Gunnison National Park

183,045

48. Guadalupe Mountains National Park

166,868

49. Congaree National Park

120,122

50. Great Basin National Park

107,526

51. Wrangell-St. Elias National Park

74,722

52. Dry Tortugas National Park

64,865

53. Katmai National Park

30,896

54. North Cascades National Park

23,865

55. Kobuk Valley National Park

16,875

56. Lake Clark National Park

16,100

57. Isle Royale National Park

14,560

58. National Park of American Samoa

13,953

59. Gates of the Arctic National Park

12,669