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Japan City Codes
O
| City Name |
City Code(s) |
| Obama, Fukui |
770 |
| Obanazawa, Yamagata |
237 |
| Obihiro, Hokkaido |
155 |
| Obu, Aichi |
562 |
| Ochi District, Ehime |
897, 898 |
| Ochi District, Shimane |
855 |
| Oda District, Okayama |
866 |
| Oda, Shimane |
8548 |
| Odate, Akita |
186 |
| Odawara, Kanagawa |
465 |
| Oe District, Tokushima |
883 |
| Ofunato, Iwate |
192 |
| Oga, Akita |
185 |
| Ogachi District, Akita |
182, 183 |
| Ogaki, Gifu |
584 |
| Ogasa District, Shizuoka |
537, 538, 547, 548 |
| Ogasawara, Tokyo |
4998 |
| Ogi District, Saga |
952 |
| Ogori, Fukuoka |
92, 942 |
| Ohara District, Shimane |
854 |
| Ohta, Gunma |
276, 284 |
| Oi District, Fukui |
770 |
| Ojiya, Niigata |
258 |
| Okawa District, Kagawa |
87, 879 |
| Okawa, Fukuoka |
944 |
| Okaya, Nagano |
266 |
| Okazaki, Aichi |
564 |
| Okegawa, Saitama |
48 |
| Oki District, Shimane |
8514 |
| Oku District, Okayama |
86, 869, 8692, 86926 |
| Okuchi, Kagoshima |
9952 |
| Okushiri District, Hokkaido |
1397 |
| Omachi, Nagano |
261 |
| Omagari, Akita |
187 |
| Ome, Tokyo |
428 |
| Omihachiman, Shiga |
748 |
| Omiya, Saitama |
48 |
| Omura, Nagasaki |
957 |
| Omuta, Fukuoka |
944 |
| Onga District, Fukuoka |
93 |
| Ono District, Fukui |
779 |
| Ono District, Gifu |
576, 577, 763, 5769 |
| Ono District, Oita |
974, 975 |
| Ono, Fukui |
779 |
| Ono, Hyogo |
794, 795 |
| Onoda, Yamaguchi |
836 |
| Onojo, Fukuoka |
92 |
| Onomichi, Hiroshima |
848 |
| Onsen District, Ehime |
89 |
| Onuma District, Fukushima |
241, 242 |
| Onyu District, Fukui |
770 |
| Osato District, Saitama |
276, 485 |
| Osato, Saitama |
493 |
| Oshika District, Miyagi |
225 |
| Oshima District, Kagoshima |
997, 9977 |
| Oshima District, Yamaguchi |
8207 |
| Oshima, Tokyocho |
4992 |
| Otake, Hiroshima |
8275 |
| Otaru, Hokkaido |
133, 134 |
| Otawara, Tochigi |
287 |
| Otokuni District, Kyoto |
75 |
| Otsu District, Yamaguchi |
837 |
| Otsu, Shiga |
77 |
| Otsuki, Yamanashi |
554 |
| Oura District, Gunma |
276 |
| Owariasahi, Aichi |
52, 561 |
| Owase, Mie |
5972 |
| Oyabe, Toyama |
766 |
| Oyama, Tochigi |
280, 282, 285, 296 |
| Ozu, Ehime |
893 |
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