UpAlphabetical listing of Places in Wakayama
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Obiki | city | Wakayama | Japan | 33.97 | 135.09 | 246 | 9428 |
| Ochiai | city | Wakayama | Japan | 33.97 | 135.22 | 830 | 14119 |
| Ochikata | city | Wakayama | Japan | 34.25 | 135.38 | 344 | 29073 |
| Oe | city | Wakayama | Japan | 33.93 | 135.42 | 830 | 2182 |
| Ogawa | city | Wakayama | Japan | 34.07 | 135.27 | 318 | 14530 |
| Ogura | city | Wakayama | Japan | 34.25 | 135.30 | 183 | 139747 |
| Ohara | city | Wakayama | Japan | 34.08 | 135.33 | 1804 | 5907 |
| Ohikiura | city | Wakayama | Japan | 33.97 | 135.09 | 246 | 9428 |
| Oi | city | Wakayama | Japan | 34.07 | 135.10 | 206 | 26162 |
| Okada | city | Wakayama | Japan | 34.17 | 135.22 | 216 | 129172 |
| Okamachi | city | Wakayama | Japan | 34.22 | 135.18 | 85 | 175407 |
| Okawa | city | Wakayama | Japan | 33.68 | 135.57 | 830 | 1264 |
| Oki | city | Wakayama | Japan | 34.05 | 135.21 | 328 | 45702 |
| Okuma | city | Wakayama | Japan | 33.98 | 135.57 | 2509 | 1716 |
| Okusasa | city | Wakayama | Japan | 34.13 | 135.32 | 830 | 19028 |
| Oniki | city | Wakayama | Japan | 33.97 | 135.09 | 246 | 9428 |
| Ono | city | Wakayama | Japan | 33.78 | 135.35 | 236 | 39062 |
| Ono-naka | city | Wakayama | Japan | 34.15 | 135.22 | 328 | 97590 |
| Onoda | city | Wakayama | Japan | 34.17 | 135.25 | 262 | 119154 |
| Onoue | city | Wakayama | Japan | 34.08 | 135.32 | 984 | 6515 |
| Oshide | city | Wakayama | Japan | 34.13 | 135.51 | 1669 | 2824 |
| Oshigawa | city | Wakayama | Japan | 34.30 | 135.31 | 830 | 122624 |
| Oshimaura | city | Wakayama | Japan | 33.47 | 135.80 | 0 | 6869 |
| Oshite | city | Wakayama | Japan | 34.13 | 135.51 | 1669 | 2824 |
| Osima | city | Wakayama | Japan | 33.47 | 135.80 | 0 | 6869 |
| Otaki | city | Wakayama | Japan | 34.18 | 135.61 | 2624 | 2493 |
| Oura | city | Wakayama | Japan | 34.02 | 135.15 | 239 | 29937 |
| Ozo | city | Wakayama | Japan | 34.12 | 135.45 | 2509 | 3429 |
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