| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oidrema | city | Parnumaa | Estonia | 58.5977778 | 23.9358333 | 62 | 1434 |
| Oina | city | Saaremaa | Estonia | 58.5672222 | 23.3322222 | 45 | 751 |
| Oinigu Kula | city | Hiiumaa | Estonia | 58.8505556 | 22.4663889 | 49 | 755 |
| Oiniku | city | Hiiumaa | Estonia | 58.8505556 | 22.4663889 | 49 | 755 |
| Oismae | city | Harjumaa | Estonia | 59.4202778 | 24.6411111 | 72 | 6176 |
| Oissaare | city | Viljandimaa | Estonia | 58.25 | 25.05 | 190 | 1540 |
| Oisu | city | Viljandimaa | Estonia | 58.1972222 | 25.5502778 | 305 | 1615 |
| Oisu | city | Jarvamaa | Estonia | 58.7536111 | 25.565 | 246 | 1313 |
| Oisu | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oisu Asundus | city | Viljandimaa | Estonia | 58.1972222 | 25.5502778 | 305 | 1615 |
| Oisu-Valjaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oisu-Väljaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oitme | city | Saaremaa | Estonia | 58.5655556 | 22.7391667 | 29 | 835 |
| Oiu | city | Viljandimaa | Estonia | 58.4177778 | 25.9661111 | 180 | 1396 |
| Oiu Asundus | city | Saaremaa | Estonia | 58.3836111 | 22.0191667 | 45 | 909 |
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