| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Oara | city | Parnumaa | Estonia | 58.4622222 | 24.3205556 | 26 | 1527 |
| Oepa | city | Parnumaa | Estonia | 58.5666667 | 24.2333333 | 78 | 1526 |
| Oese | city | Parnumaa | Estonia | 58.6455556 | 24.5080556 | 78 | 1514 |
| Ohu | city | Parnumaa | Estonia | 58.3897222 | 23.8002778 | 32 | 1385 |
| Oidrema | city | Parnumaa | Estonia | 58.5977778 | 23.9358333 | 62 | 1434 |
| Ojasoo | city | Parnumaa | Estonia | 58.0858333 | 24.535 | 68 | 1355 |
| Olla | city | Parnumaa | Estonia | 58.4166667 | 23.7666667 | 19 | 1505 |
| Oore | city | Parnumaa | Estonia | 58.4644444 | 24.7675 | 62 | 1527 |
| Oorekula | city | Parnumaa | Estonia | 58.4644444 | 24.7675 | 62 | 1527 |
| Ooreküla | city | Parnumaa | Estonia | 58.4644444 | 24.7675 | 62 | 1527 |
| Oraiyye | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Orajoe | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Orajoe Mois | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Orajõe | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Orajõe Mõis | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Oraste | city | Parnumaa | Estonia | 58.4033333 | 24.6302778 | 32 | 1531 |
| Orayeas | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Orayye | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Ore | city | Parnumaa | Estonia | 58.4644444 | 24.7675 | 62 | 1527 |
| Orikula | city | Parnumaa | Estonia | 58.6480556 | 25.1880556 | 147 | 1521 |
| Oriküla | city | Parnumaa | Estonia | 58.6480556 | 25.1880556 | 147 | 1521 |
| Orrenhof | city | Parnumaa | Estonia | 57.9536111 | 24.4044444 | 55 | 915 |
| Oyaso | city | Parnumaa | Estonia | 58.0858333 | 24.535 | 68 | 1355 |
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