| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ōna | city | Okinawa-ken | Japan | 26.2166667 | 127.7166667 | 164 | 36136 |
| Ōnakajima | city | Yamagata-ken | Japan | 38.65 | 140 | 958 | 15810 |
| Ōnakashima | city | Toyama-ken | Japan | 36.6833333 | 137.2666667 | 121 | 31584 |
| Ōnakashima | city | Yamagata-ken | Japan | 38.65 | 140 | 958 | 15810 |
| Ōnishi | city | Ehime-ken | Japan | 34.0666667 | 132.9333333 | 282 | 25618 |
| Ōnishi | city | Gifu-ken | Japan | 36.0833333 | 137.3 | 2828 | 24038 |
| Ōno | city | Kagoshima-ken | Japan | 30.6333333 | 131.05 | 9 | 14306 |
| Ōno | city | Hiroshima-ken | Japan | 34.2833333 | 132.2666667 | 3 | 28084 |
| Ōno | city | Kochi-ken | Japan | 33.2333333 | 132.85 | 603 | 15055 |
| Ōno | city | Hyogo-ken | Japan | 34.3166667 | 134.85 | 295 | 78456 |
| Ōno | city | Kyoto-fu | Japan | 35.2833333 | 135.5166667 | 629 | 69615 |
| Ōno | city | Shiga-ken | Japan | 34.9333333 | 136.2333333 | 764 | 47109 |
| Ōno | city | Fukui-ken | Japan | 35.9833333 | 136.4833333 | 613 | 23889 |
| Ōno | city | Ishikawa-ken | Japan | 36.6 | 136.6 | 19 | 19126 |
| Ōno | city | Aichi-ken | Japan | 34.9333333 | 136.8166667 | 0 | 43301 |
| Ōno | city | Aichi-ken | Japan | 34.95 | 137.6 | 328 | 157935 |
| Ōno | city | Saitama-ken | Japan | 35.9883333 | 139.2022222 | 1148 | 216430 |
| Ōno | city | Hokkaido | Japan | 41.8758333 | 140.6397222 | 62 | 8113 |
| Ōno | city | Aomori-ken | Japan | 40.8166667 | 140.7333333 | 16 | 13377 |
| Ōno | city | Iwate-ken | Japan | 40.2836111 | 141.6241667 | 784 | 10638 |
| Ōno-chō | city | Aichi-ken | Japan | 34.9333333 | 136.8166667 | 0 | 43301 |
| Ōnochō | city | Kanagawa-ken | Japan | 35.4666667 | 139.6333333 | 3 | 350582 |
| Ōnogi | city | Ishikawa-ken | Japan | 37.0666667 | 137.05 | 3 | 12166 |
| Ōnohama | city | Shiga-ken | Japan | 35.1666667 | 136.1 | 278 | 27437 |
| Ōnoki | city | Mie-ken | Japan | 34.4333333 | 136.6333333 | 482 | 39086 |
| Ōnomachi | city | Ishikawa-ken | Japan | 36.6 | 136.6 | 19 | 19126 |
| Ōnomachi | city | Kanagawa-ken | Japan | 35.4666667 | 139.6333333 | 3 | 350582 |
| Ōnomachi | city | Hokkaido | Japan | 41.8758333 | 140.6397222 | 62 | 8113 |
| Ōnoshimachi | city | Fukushima-ken | Japan | 37.2833333 | 140.6333333 | 1469 | 18652 |
| Ōnoura | city | Fukuoka-ken | Japan | 33.0333333 | 130.4666667 | 259 | 76840 |
| Ōnuma | city | Mie-ken | Japan | 33.9333333 | 135.9666667 | 564 | 40065 |
| Ōnuma | city | Aichi-ken | Japan | 35.0333333 | 137.3166667 | 1407 | 164584 |
| Ōnuma | city | Hokkaido | Japan | 41.9738889 | 140.6905556 | 524 | 8103 |
| Ōnuma-shigai | city | Hokkaido | Japan | 41.9738889 | 140.6905556 | 524 | 8103 |
| Ōnyū | city | Kyoto-fu | Japan | 35.5166667 | 135.35 | 528 | 35583 |
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