| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ooi | city | Shimane-ken | Japan | 36.05 | 133.1 | 0 | 4901 |
| Oomi | city | Nagasaki-ken | Japan | 34.4666667 | 129.2833333 | 305 | 11194 |
| Oomori | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Oozu | city | Toyama-ken | Japan | 36.8 | 137.4 | 111 | 18472 |
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