UpAlphabetical listing of Places in Yamagata
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| O-warabioka | city | Yamagata | Japan | 38.99 | 139.94 | 209 | 23001 |
| Oashizawa | city | Yamagata | Japan | 38.85 | 140.15 | 830 | 3392 |
| Obanasawa | city | Yamagata | Japan | 38.60 | 140.40 | 318 | 18920 |
| Obanazawa | city | Yamagata | Japan | 38.60 | 140.40 | 318 | 18920 |
| Obanazawa-chhī | city | Yamagata | Japan | 38.60 | 140.40 | 318 | 18920 |
| Obanazawa-shi | city | Yamagata | Japan | 38.60 | 140.40 | 318 | 18920 |
| Obato | city | Yamagata | Japan | 38.69 | 139.65 | 830 | 2725 |
| Ochiaidaki | city | Yamagata | Japan | 38.97 | 140.36 | 1669 | 3430 |
| Ochiaitaki | city | Yamagata | Japan | 38.97 | 140.36 | 1669 | 3430 |
| Oguni | city | Yamagata | Japan | 38.06 | 139.75 | 830 | 1342 |
| Oguni-machi | city | Yamagata | Japan | 38.06 | 139.75 | 830 | 1342 |
| Ogunimachi | city | Yamagata | Japan | 38.06 | 139.75 | 830 | 1342 |
| Ohori | city | Yamagata | Japan | 38.77 | 140.47 | 830 | 3472 |
| Oisemachi | city | Yamagata | Japan | 37.93 | 139.99 | 1669 | 9064 |
| Oishizawa | city | Yamagata | Japan | 37.97 | 139.80 | 1092 | 1308 |
| Oiwagawa | city | Yamagata | Japan | 38.61 | 139.58 | 180 | 2351 |
| Okubo | city | Yamagata | Japan | 38.47 | 140.33 | 291 | 25373 |
| Okuni | city | Yamagata | Japan | 38.06 | 139.75 | 830 | 1342 |
| Onabe | city | Yamagata | Japan | 38.54 | 139.61 | 328 | 3687 |
| Onakashima | city | Yamagata | Japan | 38.65 | 140.00 | 958 | 2597 |
| Osawa | city | Yamagata | Japan | 37.84 | 140.20 | 1669 | 19251 |
| Oshikiri-shinden | city | Yamagata | Japan | 38.80 | 139.85 | 49 | 37487 |
| Otori | city | Yamagata | Japan | 38.47 | 139.77 | 1026 | 85 |
| Otori | city | Yamagata | Japan | 38.47 | 139.77 | 967 | 85 |
| Otorie | city | Yamagata | Japan | 38.56 | 140.29 | 954 | 8143 |
| Oyachi | city | Yamagata | Japan | 38.84 | 140.21 | 341 | 3924 |
| Oyama | city | Yamagata | Japan | 38.75 | 139.77 | 111 | 56455 |
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