| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Oeti | city | Jarvamaa | Estonia | 59.05 | 25.7152778 | 311 | 1302 |
| Oisu | city | Jarvamaa | Estonia | 58.7536111 | 25.565 | 246 | 1313 |
| Oisu | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oisu-Valjaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oisu-Väljaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oja | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Ojakula | city | Jarvamaa | Estonia | 59.0166667 | 25.5833333 | 265 | 1302 |
| Ojakula | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Ojakula | city | Jarvamaa | Estonia | 59.2838889 | 25.7686111 | 298 | 3923 |
| Ojaküla | city | Jarvamaa | Estonia | 59.0166667 | 25.5833333 | 265 | 1302 |
| Ojaküla | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Ojaküla | city | Jarvamaa | Estonia | 59.2838889 | 25.7686111 | 298 | 3923 |
| Ole | city | Jarvamaa | Estonia | 58.9833333 | 25.8333333 | 291 | 1303 |
| Ollepa | city | Jarvamaa | Estonia | 58.6663889 | 25.5566667 | 239 | 1434 |
| Ollikula | city | Jarvamaa | Estonia | 58.9666667 | 25.6833333 | 255 | 1303 |
| Ollikyula | city | Jarvamaa | Estonia | 58.9666667 | 25.6833333 | 255 | 1303 |
| Olliküla | city | Jarvamaa | Estonia | 58.9666667 | 25.6833333 | 255 | 1303 |
| Olustvere | city | Jarvamaa | Estonia | 58.7166667 | 25.5666667 | 239 | 1316 |
| Ootla | city | Jarvamaa | Estonia | 58.9419444 | 25.7491667 | 269 | 1306 |
| Ootla Asundus | city | Jarvamaa | Estonia | 58.9419444 | 25.7491667 | 269 | 1306 |
| Orametsa | city | Jarvamaa | Estonia | 59.1152778 | 25.7844444 | 344 | 1302 |
| Orgmetsa | city | Jarvamaa | Estonia | 59.1152778 | 25.7844444 | 344 | 1302 |
| Orikula | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Oriküla | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Otiku | city | Jarvamaa | Estonia | 58.9866667 | 25.5705556 | 278 | 1303 |
| Oya | city | Jarvamaa | Estonia | 58.8047222 | 25.7097222 | 209 | 1310 |
| Oyakyula | city | Jarvamaa | Estonia | 59.0166667 | 25.5833333 | 265 | 1302 |
| Oyakyula | city | Jarvamaa | Estonia | 59.2838889 | 25.7686111 | 298 | 3923 |
| Oytla | city | Jarvamaa | Estonia | 58.9419444 | 25.7491667 | 269 | 1306 |
| Oyzu | city | Jarvamaa | Estonia | 58.7536111 | 25.565 | 246 | 1313 |
| Oyzu-Vyal'yaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
| Oyzu-Vyalʼyaotsa | city | Jarvamaa | Estonia | 58.7666667 | 25.5666667 | 239 | 1313 |
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