| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| O | city | Okinawa-ken | Japan | 26.125 | 127.7702778 | 0 | 18428 |
| Obama | city | Okinawa-ken | Japan | 24.3333333 | 123.9833333 | 3 | 5225 |
| Obo | city | Okinawa-ken | Japan | 26.65 | 128.1166667 | 272 | 31714 |
| Odo | city | Okinawa-ken | Japan | 26.0902778 | 127.7022222 | 3 | 24681 |
| Odomari | city | Okinawa-ken | Japan | 26.6333333 | 128.2333333 | 0 | 28373 |
| Ofu | city | Okinawa-ken | Japan | 26.125 | 127.7702778 | 0 | 18428 |
| Oganeku | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Ogido | city | Okinawa-ken | Japan | 26.2886111 | 127.7894444 | 3 | 32244 |
| Ogidō | city | Okinawa-ken | Japan | 26.2886111 | 127.7894444 | 3 | 32244 |
| Ogimi | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Ogimi-son | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Ogumui | city | Okinawa-ken | Japan | 26.65 | 127.8833333 | 285 | 25296 |
| Ogusuku | city | Okinawa-ken | Japan | 26.15 | 127.75 | 462 | 29201 |
| Ohama | city | Okinawa-ken | Japan | 24.3333333 | 124.2 | 0 | 12951 |
| Ohama | city | Okinawa-ken | Japan | 26.2333333 | 127.3166667 | 0 | 6389 |
| Ohama | city | Okinawa-ken | Japan | 26.6833333 | 127.8833333 | 190 | 19436 |
| Ohara | city | Okinawa-ken | Japan | 26.3547222 | 126.7177778 | 52 | 12868 |
| Oharu | city | Okinawa-ken | Japan | 26.3547222 | 126.7177778 | 52 | 12868 |
| Ohikawa | city | Okinawa-ken | Japan | 26.1030556 | 127.6672222 | 3 | 24681 |
| Ojana | city | Okinawa-ken | Japan | 26.2666667 | 127.7333333 | 13 | 25987 |
| Ojimi | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Okaneku | city | Okinawa-ken | Japan | 26.5880556 | 127.9761111 | 124 | 36408 |
| Okaneku | city | Okinawa-ken | Japan | 26.7 | 128.1166667 | 311 | 19134 |
| Oki | city | Okinawa-ken | Japan | 26.3833333 | 127.75 | 3 | 36376 |
| Oki | city | Okinawa-ken | Japan | 26.2333333 | 127.7833333 | 3 | 31580 |
| Okinawa | city | Okinawa-ken | Japan | 26.3358333 | 127.8013889 | 3 | 43652 |
| Okobori | city | Okinawa-ken | Japan | 26.65 | 127.8833333 | 285 | 25296 |
| Okoku | city | Okinawa-ken | Japan | 26.1705556 | 127.7591667 | 462 | 34482 |
| Okota | city | Okinawa-ken | Japan | 26.1705556 | 127.7591667 | 462 | 34482 |
| Oku | city | Okinawa-ken | Japan | 26.8333333 | 128.2833333 | 157 | 30611 |
| Okuma | city | Okinawa-ken | Japan | 26.2536111 | 127.7833333 | 3 | 32244 |
| Okuma | city | Okinawa-ken | Japan | 26.7333333 | 128.1833333 | 711 | 33282 |
| Omine | city | Okinawa-ken | Japan | 26.1833333 | 127.6333333 | 0 | 15071 |
| Ona | city | Okinawa-ken | Japan | 26.2166667 | 127.7166667 | 164 | 36136 |
| Onaga | city | Okinawa-ken | Japan | 26.1555556 | 127.6727778 | 6 | 35187 |
| Onaga | city | Okinawa-ken | Japan | 26.2375 | 127.7397222 | 104 | 36136 |
| Onjo | city | Okinawa-ken | Japan | 26.2886111 | 127.7894444 | 3 | 32244 |
| Onjō | city | Okinawa-ken | Japan | 26.2886111 | 127.7894444 | 3 | 32244 |
| Onna | city | Okinawa-ken | Japan | 26.4927778 | 127.8508333 | 597 | 20454 |
| Ora | city | Okinawa-ken | Japan | 24.85 | 125.3 | 62 | 12618 |
| Ora | city | Okinawa-ken | Japan | 26.5530556 | 128.0391667 | 0 | 40479 |
| Oramata | city | Okinawa-ken | Japan | 26.5666667 | 128.05 | 334 | 37922 |
| Oroku | city | Okinawa-ken | Japan | 26.2 | 127.65 | 3 | 15071 |
| Osato | city | Okinawa-ken | Japan | 26.1244444 | 127.6888889 | 36 | 24681 |
| Osato | city | Okinawa-ken | Japan | 26.1833333 | 127.7666667 | 26 | 34482 |
| Oshima | city | Okinawa-ken | Japan | 26.125 | 127.7702778 | 0 | 18428 |
| Oshittai | city | Okinawa-ken | Japan | 26.5833333 | 128.1 | 265 | 28899 |
| Osunohana | city | Okinawa-ken | Japan | 26.4516667 | 127.8511111 | 82 | 27045 |
| Ota | city | Okinawa-ken | Japan | 26.3333333 | 126.75 | 0 | 15987 |
| Ota | city | Okinawa-ken | Japan | 26.3513889 | 127.8594444 | 3 | 28992 |
| Otomari | city | Okinawa-ken | Japan | 26.6333333 | 128.2333333 | 0 | 28373 |
| Ou | city | Okinawa-ken | Japan | 26.125 | 127.7702778 | 0 | 18428 |
| Ouki | city | Okinawa-ken | Japan | 26.2333333 | 127.7833333 | 3 | 31580 |
| Oura | city | Okinawa-ken | Japan | 24.85 | 125.3 | 62 | 12618 |
| Oura | city | Okinawa-ken | Japan | 26.5530556 | 128.0391667 | 0 | 40479 |
| Owan | city | Okinawa-ken | Japan | 26.3666667 | 127.75 | 3 | 37628 |
| Oyadomari | city | Okinawa-ken | Japan | 26.7011111 | 127.9238889 | 88 | 27033 |
| Oyama | city | Okinawa-ken | Japan | 26.2666667 | 127.7333333 | 13 | 25987 |
| Oyashi | city | Okinawa-ken | Japan | 26.4 | 127.7666667 | 6 | 36376 |
| Oyodomari | city | Okinawa-ken | Japan | 26.7011111 | 127.9238889 | 88 | 27033 |
| Ozato | city | Okinawa-ken | Japan | 26.1244444 | 127.6888889 | 36 | 24681 |
| Ozatu | city | Okinawa-ken | Japan | 26.1833333 | 127.7666667 | 26 | 34482 |
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