| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ochikawa | city | Tokyo-to | Japan | 35.6544444 | 139.4555556 | 127 | 790761 |
| Odawaracho | city | Tokyo-to | Japan | 35.6666667 | 139.7833333 | 3 | 733224 |
| OdawarachÅ | city | Tokyo-to | Japan | 35.6666667 | 139.7833333 | 3 | 733224 |
| Ogawa-shinden | city | Tokyo-to | Japan | 35.7333333 | 139.4833333 | 242 | 733003 |
| Ogigaura | city | Tokyo-to | Japan | 27.0666667 | 142.2 | 364 | 12003 |
| Ogikubo | city | Tokyo-to | Japan | 35.7 | 139.6166667 | 144 | 799255 |
| Ogimura | city | Tokyo-to | Japan | 27.0666667 | 142.2 | 364 | 12003 |
| Ogiura | city | Tokyo-to | Japan | 27.0666667 | 142.2 | 364 | 12003 |
| Ogu | city | Tokyo-to | Japan | 35.75 | 139.7666667 | 16 | 796065 |
| Ogumachi | city | Tokyo-to | Japan | 35.75 | 139.7666667 | 16 | 796065 |
| Oi-Kaigancho | city | Tokyo-to | Japan | 35.5833333 | 139.7333333 | 9 | 591163 |
| Oi-Kitahamagawacho | city | Tokyo-to | Japan | 35.6 | 139.75 | 0 | 500345 |
| Oi-Minamihamagawacho | city | Tokyo-to | Japan | 35.6 | 139.7333333 | 26 | 705210 |
| Oi-Suzugamoricho | city | Tokyo-to | Japan | 35.5833333 | 139.7333333 | 9 | 591163 |
| Oji | city | Tokyo-to | Japan | 35.75 | 139.7166667 | 75 | 793984 |
| Oji | city | Tokyo-to | Japan | 35.7666667 | 139.7333333 | 32 | 644167 |
| Oji-ku | city | Tokyo-to | Japan | 35.7666667 | 139.7333333 | 32 | 644167 |
| Ojicho | city | Tokyo-to | Japan | 35.75 | 139.7166667 | 75 | 793984 |
| Ojimachi | city | Tokyo-to | Japan | 35.75 | 139.7166667 | 75 | 793984 |
| Ojimachi | city | Tokyo-to | Japan | 35.7666667 | 139.7333333 | 32 | 644167 |
| Okada | city | Tokyo-to | Japan | 34.7833333 | 139.3833333 | 495 | 30355 |
| Okage | city | Tokyo-to | Japan | 33.1 | 139.7833333 | 728 | 22575 |
| Okasato | city | Tokyo-to | Japan | 33.1 | 139.7833333 | 728 | 22575 |
| Okata | city | Tokyo-to | Japan | 34.7833333 | 139.3833333 | 495 | 30355 |
| Okazato | city | Tokyo-to | Japan | 33.1 | 139.7833333 | 728 | 22575 |
| Oki | city | Tokyo-to | Japan | 26.65 | 142.15 | 734 | 9139 |
| Okimura | city | Tokyo-to | Japan | 26.65 | 142.15 | 734 | 9139 |
| Okubo | city | Tokyo-to | Japan | 34.1166667 | 139.5166667 | 715 | 23465 |
| Okubo | city | Tokyo-to | Japan | 35.7 | 139.7 | 104 | 802746 |
| Okubo | city | Tokyo-to | Japan | 35.7 | 139.7166667 | 101 | 781610 |
| Okumachi | city | Tokyo-to | Japan | 35.75 | 139.7666667 | 16 | 796065 |
| Okura | city | Tokyo-to | Japan | 35.5847222 | 139.4702778 | 164 | 681366 |
| Omaki | city | Tokyo-to | Japan | 34.6833333 | 139.4166667 | 0 | 20214 |
| Ome | city | Tokyo-to | Japan | 35.7838889 | 139.2430556 | 702 | 801906 |
| Omori | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Omorimachi | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Omura | city | Tokyo-to | Japan | 27.0833333 | 142.1833333 | 0 | 12003 |
| Oomori | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Otemachi | city | Tokyo-to | Japan | 35.6833333 | 139.7666667 | 13 | 733224 |
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