1: The Republic of Biscayne NP
Pop: 5,461 Mil

2: The Republic of Mount Rainier NP
Pop: 5,443 Mil

3: The Republic of Canyonlands NP
Pop: 5,439 Mil

4: The Republic of Great Sand Dunes NP
Pop: 5,437 Mil

5: The Republic of Channel Islands NP
Pop: 5,435 Mil

6: The Republic of Indiana Dunes NP
Pop: 5,433 Mil

7: The Republic of Mesa Verde NP
Pop: 5,433 Mil

8: The Republic of Everglades NP
Pop: 5,430 Mil

9: The Republic of Gates of the Arctic NP
Pop: 5,429 Mil

10: The Republic of Olympic NP
Pop: 5,426 Mil

11: The Republic of Sequoia NP
Pop: 5,426 Mil

12: The Republic of Haleakala NP
Pop: 5,425 Mil

13: The Republic of Isle Royale NP
Pop: 5,424 Mil

14: The Republic of North Cascades NP
Pop: 5,424 Mil

15: The Republic of Great Basin NP
Pop: 5,423 Mil

16: The Republic of Grand Canyon NP
Pop: 5,419 Mil

17: The Republic of Great Smoky Mountains NP
Pop: 5,418 Mil

18: The Republic of Hawaii Volcanoes NP
Pop: 5,418 Mil

19: The Republic of Hot Springs NP
Pop: 5,417 Mil

20: The Republic of Lassen Volcanic NP
Pop: 5,417 Mil

21: The Republic of Kenai Fjords NP
Pop: 5,416 Mil

22: The Republic of Grand Teton NP
Pop: 5,413 Mil

23: The Republic of Gateway Arch NP
Pop: 5,410 Mil

24: The Republic of Zion NP
Pop: 5,409 Mil

25: The Republic of Saguaro NP
Pop: 5,408 Mil

26: The Republic of Yellowstone NP-
Pop: 5,407 Mil

27: The Republic of Joshua Tree NP
Pop: 5,406 Mil

28: The Republic of Wind Cave NP
Pop: 5,405 Mil

29: The Republic of Redwood NP
Pop: 5,403 Mil

30: The Republic of Death Valley NP
Pop: 5,402 Mil

31: The Republic of Dry Tortugas NP
Pop: 5,400 Mil

32: The Republic of Arches NP
Pop: 5,398 Mil

33: The Republic of Badlands NP
Pop: 5,396 Mil

34: The Republic of Congaree NP
Pop: 5,396 Mil

35: The Republic of Pinnacles NP
Pop: 5,395 Mil

36: The Republic of Lake Clark NP
Pop: 5,394 Mil

37: The Republic of American Samoa NP
Pop: 5,393 Mil

38: The Republic of Black Canyon of the Gunnison NP
Pop: 5,393 Mil

39: The Republic of Denali NP
Pop: 5,392 Mil

40: The Republic of Capitol Reef NP
Pop: 5,391 Mil

41: The Republic of Crater Lake NP
Pop: 5,391 Mil

42: The Republic of Virgin Islands NP
Pop: 5,390 Mil

43: The Republic of Big Bend NP
Pop: 5,389 Mil

44: The Republic of Katmai NP
Pop: 5,389 Mil

45: The Republic of Rocky Mountain NP
Pop: 5,388 Mil

46: The Republic of White Sands NP
Pop: 5,386 Mil

47: The Republic of Carlsbad Caverns NP
Pop: 5,384 Mil

48: The Republic of Theodore Roosevelt NP
Pop: 5,384 Mil

49: The Republic of Glacier Bay NP
Pop: 5,383 Mil

50: The Republic of Wrangell St Elias NP
Pop: 5,383 Mil

51: The Republic of Glacier NP
Pop: 5,382 Mil

52: The Republic of New River Gorge NP
Pop: 5,381 Mil

53: The Republic of Kobuk Valley NP
Pop: 5,380 Mil

54: The Republic of Shenandoah NP
Pop: 5,379 Mil

55: The Republic of Yosemite NP
Pop: 5,377 Mil

56: The Republic of Petrified Forest NP
Pop: 5,374 Mil

57: The Republic of Guadalupe Mountains NP
Pop: 5,372 Mil

58: The Republic of Cuyahoga Valley NP
Pop: 5,367 Mil

59: The Republic of Voyageurs NP
Pop: 5,367 Mil

60: The Republic of Bryce Canyon NP
Pop: 5,366 Mil

61: The Republic of Acadia NP
Pop: 5,364 Mil

62: The Republic of Kings Canyon NP
Pop: 5,358 Mil

63: The Republic of Mammoth Cave NP
Pop: 5,358 Mil