51. Oninayan
52. Oninayan-To
53. Oniotto
54. Oniotto Island
55. Oniotto-to
56. Onmak
57. Onmak East Pass
58. Onmak Island
59. Onumak
60. Onwot Island
61. Oo
62. Ooa
63. Ooa Island
64. Oratto To
65. Oreba
66. Oreba Island
67. Orimeshi
68. Ormed
69. Ormed Island

70. Oromed
71. Oroto To
72. Orotto-to
73. Orubebbu Island
74. Oruk
75. Osa
76. Oscar
77. Ost-kap
78. Ost-Kap
79. Ostrov Novago Goda
80. Otdia Island
81. Otdia Island
82. Otdia Islands
83. Otirik
84. Otori Island
85. Ourukaen
86. Ourukaen Island
87. Ourukaen Pass
88. Ourukaen-to
89. Owa