| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ōma | city | Shizuoka-ken | Japan | 35.1666667 | 138.1166667 | 2952 | 55865 |
| Ōma | city | Shizuoka-ken | Japan | 35.15 | 138.1666667 | 2952 | 55893 |
| Ōma | city | Shizuoka-ken | Japan | 35.1333333 | 138.2333333 | 1640 | 55893 |
| Ōma | city | Aomori-ken | Japan | 41.5219444 | 140.9066667 | 82 | 4494 |
| Ōma | city | Hokkaido | Japan | 41.75 | 141.0833333 | 0 | 3630 |
| Ōmachi | city | Saga-ken | Japan | 33.2 | 130.1166667 | 111 | 42484 |
| Ōmachi | city | Ehime-ken | Japan | 33.9 | 133.1833333 | 190 | 27667 |
| Ōmachi | city | Hiroshima-ken | Japan | 34.3833333 | 133.2166667 | 3 | 25316 |
| Ōmachi | city | Fukui-ken | Japan | 36.0666667 | 136.2166667 | 55 | 23867 |
| Ōmachi | city | Nagano-ken | Japan | 36.5 | 137.8666667 | 2552 | 19506 |
| Ōmachi | city | Nagano-ken | Japan | 36.8333333 | 138.4166667 | 1482 | 19422 |
| Ōmachi | city | Ibaraki-ken | Japan | 36.3833333 | 140.4666667 | 68 | 59259 |
| Ōmachi | city | Hokkaido | Japan | 42.9833333 | 144.3833333 | 36 | 4927 |
| Ōmae | city | Niigata-ken | Japan | 36.9333333 | 137.85 | 1138 | 23270 |
| Ōmagari | city | Akita-ken | Japan | 40.1 | 140.0166667 | 26 | 10804 |
| Ōmagari | city | Akita-ken | Japan | 39.45 | 140.4833333 | 98 | 12131 |
| Ōmagari | city | Hokkaido | Japan | 42.85 | 140.7333333 | 767 | 7991 |
| Ōmagari | city | Miyagi-ken | Japan | 38.1666667 | 140.9 | 42 | 37104 |
| Ōmagari | city | Hokkaido | Japan | 42.9688889 | 141.4738889 | 387 | 7974 |
| Ōmagari | city | Hokkaido | Japan | 45.0169444 | 141.8513889 | 32 | 7707 |
| Ōmagari | city | Hokkaido | Japan | 44.7 | 142.6 | 905 | 7749 |
| Ōmagari | city | Hokkaido | Japan | 44.0166667 | 144.2333333 | 91 | 7038 |
| Ōmagoe | city | Aomori-ken | Japan | 40.4844444 | 139.9527778 | 328 | 6409 |
| Ōmagoshi | city | Aomori-ken | Japan | 40.4844444 | 139.9527778 | 328 | 6409 |
| Ōmaki | city | Shimane-ken | Japan | 35.1166667 | 133.05 | 1564 | 20282 |
| Ōmaki | city | Toyama-ken | Japan | 36.5 | 137 | 1968 | 31739 |
| Ōmaki | city | Niigata-ken | Japan | 37.7 | 139.4 | 492 | 23366 |
| Ōmaki | city | Tokyo-to | Japan | 34.6833333 | 139.4166667 | 0 | 20214 |
| Ōmakoshi | city | Aomori-ken | Japan | 40.4844444 | 139.9527778 | 328 | 6409 |
| Ōmama | city | Gumma-ken | Japan | 36.4333333 | 139.2833333 | 524 | 38017 |
| Ōmata | city | Mie-ken | Japan | 33.9666667 | 136.1 | 1062 | 39137 |
| Ōme | city | Tokyo-to | Japan | 35.7838889 | 139.2430556 | 702 | 801906 |
| Ōmi | city | Nagasaki-ken | Japan | 34.4666667 | 129.2833333 | 305 | 11194 |
| Ōmi | city | Niigata-ken | Japan | 37.0166667 | 137.8 | 547 | 14306 |
| Ōmika | city | Fukushima-ken | Japan | 37.6 | 141 | 75 | 10647 |
| Ōminato | city | Aomori-ken | Japan | 41.2730556 | 141.1552778 | 3 | 13187 |
| Ōminatochō | city | Aomori-ken | Japan | 41.2730556 | 141.1552778 | 3 | 13187 |
| Ōminatomachi | city | Mie-ken | Japan | 34.5166667 | 136.7333333 | 3 | 23334 |
| Ōmine | city | Okinawa-ken | Japan | 26.1833333 | 127.6333333 | 0 | 15071 |
| Ōmisaki | city | Hokkaido | Japan | 45.5091667 | 141.9372222 | 177 | 2561 |
| Ōmisawa | city | Aomori-ken | Japan | 40.6836111 | 141.3597222 | 131 | 17371 |
| Ōmiya | city | Shizuoka-ken | Japan | 35.2166667 | 138.6166667 | 311 | 55837 |
| Ōmiya | city | Shizuoka-ken | Japan | 35.2166667 | 138.6166667 | 311 | 55837 |
| Ōmiya | city | Saitama-ken | Japan | 35.9072222 | 139.6202778 | 52 | 216658 |
| Ōmiya | city | Tochigi-ken | Japan | 36.7333333 | 139.8666667 | 702 | 37294 |
| Ōmiya | city | Ibaraki-ken | Japan | 36.55 | 140.4166667 | 173 | 59130 |
| Ōmori | city | Shimane-ken | Japan | 35.1166667 | 132.45 | 656 | 13232 |
| Ōmori | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Ōmori | city | Chiba-ken | Japan | 35.8333333 | 140.15 | 65 | 129588 |
| Ōmori | city | Yamagata-ken | Japan | 38.3088889 | 140.3872222 | 587 | 15884 |
| Ōmori | city | Hokkaido | Japan | 43.15 | 140.4 | 0 | 3436 |
| Ōmori | city | Akita-ken | Japan | 39.35 | 140.4333333 | 157 | 12145 |
| Ōmorichō | city | Shimane-ken | Japan | 35.1166667 | 132.45 | 656 | 13232 |
| Ōmorimachi | city | Tokyo-to | Japan | 35.5666667 | 139.7333333 | 13 | 591163 |
| Ōmu | city | Hokkaido | Japan | 44.5752778 | 142.9569444 | 101 | 6776 |
| Ōmu-kawajiri | city | Hokkaido | Japan | 44.55 | 142.9833333 | 65 | 4790 |
| Ōmuda | city | Fukuoka-ken | Japan | 33.0333333 | 130.45 | 127 | 55852 |
| Ōmura | city | Nagasaki-ken | Japan | 32.9213889 | 129.9538889 | 65 | 17434 |
| Ōmura | city | Gumma-ken | Japan | 36.55 | 138.7666667 | 1952 | 37952 |
| Ōmura | city | Tokyo-to | Japan | 27.0833333 | 142.1833333 | 0 | 12003 |
| Ōmurozasu | city | Yamanashi-ken | Japan | 35.5261111 | 139.0922222 | 1601 | 261387 |
| Ōmuta | city | Fukuoka-ken | Japan | 33.0333333 | 130.45 | 127 | 55852 |
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