Top 10 US National Parks - by number of visitors in 2015

Check 2017 rankings here

Check 2016 rankings here

Check 2014 rankings here

Check Current Year (Latest) rankings here

1.  Great Smoky Mountains NP  (10,712,674)

2.  Grand Canyon NP  (5,520,736)

3.  Rocky Mountains NP  (4,155,916)

4.  Yosemite NP  (4,150,217)

5.  Yellowstone NP  (4,097,710)

6.  Zion NP  (3,648,846)

7.  Olympic NP  (3,263,761)

8.  Grand Teton NP  (3,149,921)

9.  Acadia NP  (2,811,184)

10.  Glacier NP  (2,366,056)

and now all remaining National Parks in order of ranking:

11. Cuyahoga Valley NP (2,284,612)

12. Joshua Tree NP (2,025,756)

13. Hawaii Volcanoes NP (1,832,660)

14. Bryce Canyon NP (1,745,804)

15. Hot Springs NP (1,418,162)

16. Arches NP (1,399,247)

17. Shenandoah NP (1,321,873)

18. Mount Rainier NP (1,237,231)

19. Haleakala NP (1,216,772)

20. Death Valley NP (1,154,843)

21. Sequoia NP (1,097,464)

22. Everglades NP (1,077,427)

23. Badlands NP (989,354)

24. Capitol Reef NP (941,029)

25. Petrified Forest NP (793,225)

26. Saguaro NP (753,446)

27. Canyonlands NP (634,607)

28. Crater Lake NP (614,712)

29. Wind Cave NP (612,198)

30. Theodore Roosevelt NP (580,033)

31. Mammoth Cave NP (566,895)

32. Denali NP (560,757)

33. Glacier Bay NP (551,353)

34. Mesa Verde NP (547,325)

35. Redwood NP (527,143)

36. Biscayne NP (508,164)

37. Kings Canyon NP (468,106)

38. Lassen Volcanic NP (468,092)

39. Carlsbad Caverns NP (445,720)

40. Virgin Islands NP (438,372)

41. Big Bend NP (381,747)

42. Channel Islands NP (324,816)

43. Great Sand Dunes NP (299,513)

44. Kenai Fjords NP (296,697)

45. Voyageurs NP (238,313)

46. Black Canyon of the Gunnison NP (209,166)

47. Pinnacles NP (206,533)

48. Guadalupe Mountains NP (169,535)

49. Great Basin NP (116,123)

50. Congaree NP (87,513)

51. Wrangell-St. Elias NP (80,366)

52. Dry Tortugas NP (70,862)

53. Katmai NP (37,818)

54. North Cascades NP (20,677)

55. Isle Royale NP (18,684)

56. Lake Clark NP (17,818)

57. National Park of American Samoa (13,892)

58. Gates of the Arctic NP (10,745)