| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ō-warabioka | city | Yamagata-ken | Japan | 38.9833333 | 139.9333333 | 209 | 15737 |
| Ōashisawa | city | Yamagata-ken | Japan | 38.8513889 | 140.1405556 | 643 | 15765 |
| Ōhori | city | Yamagata-ken | Japan | 38.7666667 | 140.4666667 | 656 | 15785 |
| Ōishi | city | Yamagata-ken | Japan | 38.9166667 | 139.9333333 | 183 | 15747 |
| Ōishida | city | Yamagata-ken | Japan | 38.5869444 | 140.3713889 | 236 | 15818 |
| Ōkubo | city | Yamagata-ken | Japan | 38.4666667 | 140.3333333 | 291 | 15846 |
| Ōmori | city | Yamagata-ken | Japan | 38.3088889 | 140.3872222 | 587 | 15884 |
| Ōnakajima | city | Yamagata-ken | Japan | 38.65 | 140 | 958 | 15810 |
| Ōnakashima | city | Yamagata-ken | Japan | 38.65 | 140 | 958 | 15810 |
| Ōsawa | city | Yamagata-ken | Japan | 38.8761111 | 140.2197222 | 328 | 15757 |
| Ōsumi | city | Yamagata-ken | Japan | 38.3263889 | 140.1705556 | 656 | 15884 |
| Ōtaki | city | Yamagata-ken | Japan | 38.9694444 | 140.3052778 | 915 | 15261 |
| Ōtorie | city | Yamagata-ken | Japan | 38.5588889 | 140.2891667 | 1158 | 15828 |
| Ōya | city | Yamagata-ken | Japan | 38.3397222 | 140.1594444 | 656 | 15874 |
| Ōyachi | city | Yamagata-ken | Japan | 38.8369444 | 140.2069444 | 446 | 15765 |
| Ōyama | city | Yamagata-ken | Japan | 38.75 | 139.7666667 | 111 | 14708 |
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