1: The Republic of Castle Mountains NM
Pop: 5,233 Mil

2: The Republic of Montezuma Castle NM
Pop: 5,232 Mil

3: The Republic of Ironwood Forest NM
Pop: 5,230 Mil

4: The Republic of Aleutian Islands WWII NM
Pop: 5,228 Mil

5: The Republic of Fort Ord NM
Pop: 5,227 Mil

6: The Republic of Santa Rosa and San Jacinto Mountains NM
Pop: 5,227 Mil

7: The Republic of Mojave Trails NM
Pop: 5,222 Mil

8: The Republic of Walnut Canyon NM
Pop: 5,219 Mil

9: The Republic of Vermilion Cliffs NM
Pop: 5,218 Mil

10: The Republic of Pipestone NM
Pop: 5,218 Mil

11: The Republic of Wupatki NM
Pop: 5,217 Mil

12: The Republic of Admiralty Island NM
Pop: 5,215 Mil

13: The Republic of Sonoran Desert NM
Pop: 5,214 Mil

14: The Republic of Sunset Crater Volcano NM
Pop: 5,209 Mil

15: The Republic of Tule Lake NM
Pop: 5,209 Mil

16: The Republic of Birmingham Civil Rights NM
Pop: 5,208 Mil

17: The Republic of Grand Canyon-Parashant NM
Pop: 5,207 Mil

18: The Republic of Navajo NM
Pop: 5,206 Mil

19: The Republic of Tonto NM
Pop: 5,206 Mil

20: The Republic of Aniakchak NM
Pop: 5,205 Mil

21: The Republic of Carrizo Plain NM
Pop: 5,203 Mil

22: The Republic of Buck Island Reef NM
Pop: 5,200 Mil

23: The Republic of Belmont-Paul Womens Equality NM
Pop: 5,200 Mil

24: The Republic of Browns Canyon NM
Pop: 5,199 Mil

25: The Republic of Sand to Snow NM
Pop: 5,198 Mil

26: The Republic of San Gabriel Mountains NM
Pop: 5,197 Mil

27: The Republic of Katahdin Woods and Waters NM-
Pop: 5,196 Mil

28: The Republic of Saint Francis Dam Disaster NM
Pop: 5,195 Mil

29: The Republic of Northeast Canyons and Seamounts NM
Pop: 5,194 Mil

30: The Republic of Rose Atoll Marine NM
Pop: 5,193 Mil

31: The Republic of Cesar E Chavez NM
Pop: 5,192 Mil

32: The Republic of Prehistoric Trackways NM-
Pop: 5,192 Mil

33: The Republic of Berryessa Snow Mountain NM
Pop: 5,191 Mil

34: The Republic of California Coastal NM
Pop: 5,191 Mil

35: The Republic of Mill Springs Battlefield NM-
Pop: 5,189 Mil

36: The Republic of Devils Tower NM
Pop: 5,187 Mil

37: The Republic of Chiricahua NM
Pop: 5,186 Mil

38: The Republic of Casa Grande Ruins NM
Pop: 5,183 Mil

39: The Republic of Virgin Islands Coral Reef NM
Pop: 5,183 Mil

40: The Republic of Tuzigoot NM
Pop: 5,181 Mil

41: The Republic of George Washington Carver NM
Pop: 5,181 Mil

42: The Republic of Russel Cave NM
Pop: 5,180 Mil

43: The Republic of Lava Beds NM
Pop: 5,180 Mil

44: The Republic of Booker T Washington NM
Pop: 5,180 Mil

45: The Republic of Hohokam Pima NM
Pop: 5,178 Mil

46: The Republic of Devils Postpile NM
Pop: 5,175 Mil

47: The Republic of Charles Young Buffalo Soldiers NM
Pop: 5,175 Mil

48: The Republic of Capulin Volcano NM-
Pop: 5,173 Mil

49: The Republic of Muir Woods NM
Pop: 5,172 Mil

50: The Republic of Homestead NM
Pop: 5,172 Mil

51: The Republic of El Morro NM-
Pop: 5,172 Mil

52: The Republic of Little Bighorn Battlefield NM
Pop: 5,171 Mil

53: The Republic of El Malpais NM-
Pop: 5,171 Mil

54: The Republic of Pipe Spring NM
Pop: 5,169 Mil

55: The Republic of Bandelier NM-
Pop: 5,168 Mil

56: The Republic of Organ Mountains-Desert Peaks NM-
Pop: 5,167 Mil

57: The Republic of Cape Krusenstern NM
Pop: 5,166 Mil

58: The Republic of Canyon de Chelly NM
Pop: 5,166 Mil

59: The Republic of Basin and Range NM-
Pop: 5,165 Mil

60: The Republic of Dinosaur NM-
Pop: 5,164 Mil

61: The Republic of Organ Pipe Cactus NM
Pop: 5,163 Mil

62: The Republic of Gila Cliff Dwellings NM-
Pop: 5,162 Mil

63: The Republic of Scotts Bluff NM-
Pop: 5,159 Mil

64: The Republic of Agua Fria NM
Pop: 5,158 Mil

65: The Republic of Harriet Tubman Underground Railroad NM-
Pop: 5,158 Mil

66: The Republic of Misty Fjords NM
Pop: 5,157 Mil

67: The Republic of Effigy Mounds NM-
Pop: 5,156 Mil

68: The Republic of Cascade-Siskiyou NM
Pop: 5,155 Mil

69: The Republic of Freedom Riders NM
Pop: 5,152 Mil

70: The Republic of Pacific Remote Islands Marine NM
Pop: 5,152 Mil

71: The Republic of Fort Pulaski NM-
Pop: 5,152 Mil

72: The Republic of Pullman NM-
Pop: 5,151 Mil

73: The Republic of Giant Sequoia NM
Pop: 5,150 Mil

74: The Republic of San Juan Islands NM
Pop: 5,149 Mil

75: The Republic of Petroglyph NM-
Pop: 5,149 Mil

76: The Republic of Jurassic NM
Pop: 5,148 Mil

77: The Republic of Tule Springs Fossil Beds NM-
Pop: 5,148 Mil

78: The Republic of Poverty Point NM-
Pop: 5,148 Mil

79: The Republic of Medgar and Myrlie Evers Home NM
Pop: 5,147 Mil

80: The Republic of Fort Union NM-
Pop: 5,147 Mil

81: The Republic of Florissant Fossil Beds NM-
Pop: 5,147 Mil

82: The Republic of Rainbow Bridge NM
Pop: 5,146 Mil

83: The Republic of Fort Mchenry NM-
Pop: 5,144 Mil

84: The Republic of Castle Clinton NM
Pop: 5,143 Mil

85: The Republic of Colorado NM-
Pop: 5,143 Mil

86: The Republic of Jewel Cave NM
Pop: 5,142 Mil

87: The Republic of Grand Staircase-Escalante NM
Pop: 5,141 Mil

88: The Republic of Cabrillo NM
Pop: 5,140 Mil

89: The Republic of Hagerman Fossil Beds NM-
Pop: 5,140 Mil

90: The Republic of Hovenweep NM-
Pop: 5,139 Mil

91: The Republic of Stonewall NM
Pop: 5,138 Mil

92: The Republic of African Burial Ground NM
Pop: 5,135 Mil

93: The Republic of Oregon Caves NM
Pop: 5,135 Mil

94: The Republic of Waco Mammoth NM
Pop: 5,135 Mil

95: The Republic of President Lincoln and Soldiers Home NM
Pop: 5,135 Mil

96: The Republic of Newberry Volcanic NM
Pop: 5,134 Mil

97: The Republic of Grand Portage NM-
Pop: 5,134 Mil

98: The Republic of Alibates Flint Quarries NM
Pop: 5,133 Mil

99: The Republic of Yucca House NM-
Pop: 5,132 Mil

100: The Republic of Bears Ears NM
Pop: 5,131 Mil

101: The Republic of Gold Butte NM-
Pop: 5,130 Mil

102: The Republic of Rio Grande del Norte NM-
Pop: 5,129 Mil

103: The Republic of Hanford Reach NM
Pop: 5,128 Mil

104: The Republic of Agate Fossil Beds NM-
Pop: 5,128 Mil

105: The Republic of Fort Matanzas NM-
Pop: 5,127 Mil

106: The Republic of Salinas Pueblo Missions NM-
Pop: 5,127 Mil

107: The Republic of George Washington Birthplace NM
Pop: 5,126 Mil

108: The Republic of Camp Nelson Heritage NM-
Pop: 5,126 Mil

109: The Republic of Fort Stanwix NM
Pop: 5,125 Mil

110: The Republic of Fossil Butte NM
Pop: 5,125 Mil

111: The Republic of Chimney Rock NM-
Pop: 5,122 Mil

112: The Republic of Fort Frederica NM-
Pop: 5,121 Mil

113: The Republic of Cedar Breaks NM
Pop: 5,120 Mil

114: The Republic of Statue of Liberty NM-
Pop: 5,118 Mil

115: The Republic of Aztec Ruins NM-
Pop: 5,118 Mil

116: The Republic of John Day Fossil Beds NM
Pop: 5,116 Mil

117: The Republic of Castillo de San Marcos NM-
Pop: 5,116 Mil

118: The Republic of Canyons of the Ancients NM-
Pop: 5,116 Mil

119: The Republic of Craters of the Moon NM-
Pop: 5,115 Mil

120: The Republic of Upper Missouri River Breaks NM-
Pop: 5,114 Mil

121: The Republic of Pompeys Pillar NM-
Pop: 5,113 Mil

122: The Republic of Governors Island NM
Pop: 5,109 Mil

123: The Republic of Military Working Dog Teams NM
Pop: 5,106 Mil

124: The Republic of Kasha-Katuwe Tent Rocks NM-
Pop: 5,100 Mil

125: The Republic of Fort Monroe NM
Pop: 5,097 Mil

126: The Republic of Mount St Helens NM
Pop: 5,097 Mil

127: The Republic of Timpanogos Cave NM
Pop: 5,092 Mil

128: The Republic of Natural Bridges NM
Pop: 5,087 Mil