UpAlphabetical listing of Places in Yamanashi
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oarashi | city | Yamanashi | Japan | 35.50 | 138.73 | 3349 | 25889 |
| Oasumi | city | Yamanashi | Japan | 35.48 | 138.82 | 2706 | 51564 |
| Obuchi | city | Yamanashi | Japan | 35.25 | 138.71 | 1902 | 89045 |
| Ochiai | city | Yamanashi | Japan | 35.29 | 138.53 | 1220 | 19640 |
| Ochiai | city | Yamanashi | Japan | 35.80 | 138.83 | 5029 | 4978 |
| Odawa | city | Yamanashi | Japan | 35.28 | 138.53 | 830 | 16233 |
| Oishi | city | Yamanashi | Japan | 35.52 | 138.73 | 2919 | 20958 |
| Okishinhata | city | Yamanashi | Japan | 35.45 | 138.86 | 3349 | 30881 |
| Oku-magino | city | Yamanashi | Japan | 35.57 | 139.11 | 1669 | 12217 |
| Okubo | city | Yamanashi | Japan | 35.52 | 139.01 | 2509 | 4765 |
| Omurozasu | city | Yamanashi | Japan | 35.53 | 139.09 | 1669 | 5629 |
| Omurozawa | city | Yamanashi | Japan | 35.32 | 138.45 | 830 | 6316 |
| On-take | city | Yamanashi | Japan | 35.77 | 138.55 | 3349 | 24978 |
| Ondashi | city | Yamanashi | Japan | 35.25 | 138.55 | 830 | 36696 |
| Onuma | city | Yamanashi | Japan | 35.52 | 138.85 | 3349 | 38148 |
| Otsuki-shi | city | Yamanashi | Japan | 35.60 | 138.93 | 1669 | 23943 |
| Oyama | city | Yamanashi | Japan | 35.50 | 138.52 | 1860 | 14012 |
| Oyashiki | city | Yamanashi | Japan | 35.22 | 138.52 | 328 | 10789 |
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