Cities — O

1. Ōami (04)
2. Ōamishirasato (04)
3. Ōarai (14)
4. Obama (06)
5. Obanazawa (44)
6. Obihiro (12)
7. Obita (27)
8. Ōbu (01)
9. Ōdachō-ōda (36)
10. Ōdate (02)
11. Odawara (19)
12. Ōfunato (16)
13. Oga (02)
14. Ōgaki (09)
15. Ogawa (01)
16. Ogawa (38)
17. Ogawamachi (34)
18. Ogi (33)
19. Ōgi (40)
20. Ogikubo (40)
21. Ogōri (07)
22. Ogōri-shimogō (45)
23. Ōguchi (01)
24. Ogura (10)
25. Ōgushi (34)
26. Ōhara (04)
27. Ōharu (01)
28. Ōi (34)
29. Ōiso (19)
30. Ōita (30)
31. Ōizumi-gakuenchō (40)
32. Ōizumimachi (40)
33. Oji (28)
34. Ōji (40)
35. Ōjima (40)
36. Ojiya (29)
37. Ōkawa (07)
38. Ōkawara (24)
39. Okaya (26)
40. Okayama (31)
41. Okazaki (01)
42. Okegawa (34)
43. Okinawa (47)
44. Okino (21)
45. Ōkubo (40)
46. Ōkubo-naka (32)
47. Ōkuchi-shinohara (18)
48. Okunoya (14)
49. Ōmachi (26)
50. Omaezaki (37)
51. Ōmagari (02)
52. Ōmamachō-ōmama (10)
53. Ōme (40)
54. Omigawa (04)
55. Ōmihachiman (35)
56. Omitama (14)
57. Ōmiya (14)
58. Ōmura (27)
59. Ōmuta (07)
60. Ono (06)
61. Ono (13)
62. Ōno (16)
63. Ōno-hara (11)
64. Onoda (45)
65. Ōnojō (07)
66. Onomichi (11)
67. Osaka (32)
68. Ōsaki (24)
69. Oshima (15)
70. Ōshū (16)
71. Ōta (10)
72. Ōta (40)
73. Ōtake (11)
74. Otaru (12)
75. Ōtawara (38)
76. Otofuke (12)
77. Ōtsu (35)
78. Ōtsuka (40)
79. Ōtsuki (46)
80. Ōuda-yamaguchi (28)
81. Ōwa (10)
82. Owariasahi (01)
83. Owase (23)
84. Oyabe (42)
85. Oyama (37)
86. Oyama (38)
87. Ōyama (37)
88. Oyamazaki (22)
89. Ōyanomachi-noboritate (21)
90. Ōzu (05)
91. Ōzu (21)