| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ōsaka | city | Osaka-fu | Japan | 34.6666667 | 135.5 | 16 | 574059 |
| Ōsakamachi | city | Fukuoka-ken | Japan | 33.8833333 | 130.8833333 | 78 | 83906 |
| Ōsaki | city | Nagasaki-ken | Japan | 33.1111111 | 129.7472222 | 114 | 23772 |
| Ōsaki | city | Nagasaki-ken | Japan | 32.6666667 | 129.9 | 3 | 25041 |
| Ōsaki | city | Nagasaki-ken | Japan | 32.6833333 | 130.35 | 3 | 19482 |
| Ōsaki | city | Kagoshima-ken | Japan | 31.425 | 131.0216667 | 39 | 24027 |
| Ōsaki | city | Wakayama-ken | Japan | 34.1333333 | 135.1333333 | 295 | 12159 |
| Ōsaki | city | Shizuoka-ken | Japan | 34.7666667 | 137.5666667 | 3 | 56515 |
| Ōsaki | city | Niigata-ken | Japan | 37.1333333 | 138.95 | 656 | 23535 |
| Ōsaki | city | Gumma-ken | Japan | 36.4833333 | 139.0166667 | 541 | 37994 |
| Ōsakina | city | Nagasaki-ken | Japan | 32.6666667 | 129.9 | 3 | 25041 |
| Ōsasu | city | Mie-ken | Japan | 34.3833333 | 136.9 | 0 | 22061 |
| Ōsato | city | Okinawa-ken | Japan | 26.1244444 | 127.6888889 | 36 | 24681 |
| Ōsato | city | Okinawa-ken | Japan | 26.1833333 | 127.7666667 | 26 | 34482 |
| Ōsatsu | city | Mie-ken | Japan | 34.3833333 | 136.9 | 0 | 22061 |
| Ōsatu | city | Mie-ken | Japan | 34.3833333 | 136.9 | 0 | 22061 |
| Ōsawa | city | Ishikawa-ken | Japan | 37.3666667 | 136.8 | 882 | 24473 |
| Ōsawa | city | Tochigi-ken | Japan | 36.6833333 | 139.75 | 935 | 37317 |
| Ōsawa | city | Saitama-ken | Japan | 35.9 | 139.7833333 | 22 | 216658 |
| Ōsawa | city | Yamagata-ken | Japan | 38.8761111 | 140.2197222 | 328 | 15757 |
| Ōsawa | city | Akita-ken | Japan | 39.2666667 | 140.3833333 | 249 | 12159 |
| Ōsawa | city | Miyagi-ken | Japan | 38.8 | 141.5333333 | 13 | 30823 |
| Ōsawa | city | Hokkaido | Japan | 45.2 | 141.6 | 29 | 5547 |
| Ōsawa | city | Miyagi-ken | Japan | 38.955 | 141.6333333 | 3 | 16915 |
| Ōsawa | city | Iwate-ken | Japan | 39.4833333 | 141.9666667 | 3 | 8597 |
| Ōsawagōshuku | city | Akita-ken | Japan | 39.5166667 | 140.3 | 314 | 12114 |
| Ōse | city | Ibaraki-ken | Japan | 36.5666667 | 140.65 | 3 | 36892 |
| Ōshima | city | Okinawa-ken | Japan | 26.125 | 127.7702778 | 0 | 18428 |
| Ōshima | city | Saga-ken | Japan | 33.7333333 | 129.6333333 | 0 | 9178 |
| Ōshima | city | Saga-ken | Japan | 33.4666667 | 129.9666667 | 0 | 18709 |
| Ōshima | city | Yamaguchi-ken | Japan | 33.9833333 | 131.8 | 0 | 10289 |
| Ōshima | city | Oita-ken | Japan | 32.95 | 132.0666667 | 0 | 3257 |
| Ōshima | city | Yamaguchi-ken | Japan | 33.9366667 | 132.1883333 | 137 | 19539 |
| Ōshima | city | Ehime-ken | Japan | 33.1833333 | 132.4 | 3 | 5041 |
| Ōshima | city | Wakayama-ken | Japan | 33.4666667 | 135.8 | 0 | 14180 |
| Ōshima | city | Toyama-ken | Japan | 36.6666667 | 137.2666667 | 173 | 31584 |
| Ōshima | city | Niigata-ken | Japan | 37.1166667 | 138.5 | 731 | 23548 |
| Ōshima | city | Niigata-ken | Japan | 38.1 | 139.5166667 | 249 | 23231 |
| Ōshimoda | city | Kagoshima-ken | Japan | 28.1 | 129.3166667 | 32 | 20006 |
| Ōshinden | city | Ehime-ken | Japan | 34.0833333 | 132.9833333 | 101 | 26104 |
| Ōshinozu | city | Tottori-ken | Japan | 35.4833333 | 133.25 | 29 | 9520 |
| Ōshio | city | Hyogo-ken | Japan | 34.7833333 | 134.7666667 | 62 | 51813 |
| Ōshio | city | Fukushima-ken | Japan | 37.6666667 | 139.9833333 | 1735 | 18551 |
| Ōshiro | city | Kagoshima-ken | Japan | 30.5833333 | 131.0333333 | 3 | 15675 |
| Ōshittai | city | Okinawa-ken | Japan | 26.5833333 | 128.1 | 265 | 28899 |
| Ōsima | city | Wakayama-ken | Japan | 33.4666667 | 135.8 | 0 | 14180 |
| Ōsinozu | city | Tottori-ken | Japan | 35.4833333 | 133.25 | 29 | 9520 |
| Ōsu | city | Hiroshima-ken | Japan | 34.2833333 | 132.4333333 | 52 | 17597 |
| Ōsu | city | Ehime-ken | Japan | 33.5 | 132.55 | 436 | 34151 |
| Ōsu | city | Miyagi-ken | Japan | 38.5166667 | 141.55 | 0 | 4944 |
| Ōsudo | city | Niigata-ken | Japan | 38.3333333 | 139.5666667 | 390 | 23170 |
| Ōsugachō | city | Hiroshima-ken | Japan | 34.4 | 132.4666667 | 173 | 35239 |
| Ōsugi | city | Kochi-ken | Japan | 33.75 | 133.6666667 | 1535 | 14180 |
| Ōsuhama | city | Miyagi-ken | Japan | 38.5166667 | 141.55 | 0 | 4944 |
| Ōsuka | city | Hiroshima-ken | Japan | 34.4 | 132.4666667 | 173 | 35239 |
| Ōsukachō | city | Hiroshima-ken | Japan | 34.4 | 132.4666667 | 173 | 35239 |
| Ōsukamachi | city | Hiroshima-ken | Japan | 34.4 | 132.4666667 | 173 | 35239 |
| Ōsumi | city | Yamagata-ken | Japan | 38.3263889 | 140.1705556 | 656 | 15884 |
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