| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Osmussaare | city | Laanemaa | Estonia | 59.2938889 | 23.3913889 | 16 | 62 |
| Ossu | city | Tartumaa | Estonia | 58.3675 | 26.6575 | 239 | 4081 |
| Osterbi | city | Laanemaa | Estonia | 58.9913889 | 23.5225 | 32 | 738 |
| Osterby | city | Laanemaa | Estonia | 58.9913889 | 23.5225 | 32 | 738 |
| Ostrova | city | Vorumaa | Estonia | 57.7813889 | 27.4361111 | 341 | 1569 |
| Osula | city | Vorumaa | Estonia | 57.8858333 | 26.8197222 | 246 | 1504 |
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