| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Odalatsi | city | Saaremaa | Estonia | 58.3925 | 22.1408333 | 101 | 1043 |
| Odalätsi | city | Saaremaa | Estonia | 58.3925 | 22.1408333 | 101 | 1043 |
| Oesaare | city | Saaremaa | Estonia | 58.3338889 | 22.8805556 | 22 | 861 |
| Oesare | city | Saaremaa | Estonia | 58.3338889 | 22.8805556 | 22 | 861 |
| Oessaare | city | Saaremaa | Estonia | 58.3338889 | 22.8805556 | 22 | 861 |
| Oeste | city | Saaremaa | Estonia | 58.5416667 | 22.7372222 | 42 | 835 |
| Oha | city | Saaremaa | Estonia | 58.3994444 | 22.5397222 | 49 | 1097 |
| Ohesaare | city | Saaremaa | Estonia | 57.9969444 | 22.0336111 | 13 | 569 |
| Ohtja | city | Saaremaa | Estonia | 58.4261111 | 22.3461111 | 104 | 1095 |
| Oina | city | Saaremaa | Estonia | 58.5672222 | 23.3322222 | 45 | 751 |
| Oitme | city | Saaremaa | Estonia | 58.5655556 | 22.7391667 | 29 | 835 |
| Oiu Asundus | city | Saaremaa | Estonia | 58.3836111 | 22.0191667 | 45 | 909 |
| Oju | city | Saaremaa | Estonia | 58.3836111 | 22.0191667 | 45 | 909 |
| Okhesare | city | Saaremaa | Estonia | 57.9969444 | 22.0336111 | 13 | 569 |
| Okht'ya | city | Saaremaa | Estonia | 58.4261111 | 22.3461111 | 104 | 1095 |
| Okhtʼya | city | Saaremaa | Estonia | 58.4261111 | 22.3461111 | 104 | 1095 |
| Olga | city | Saaremaa | Estonia | 58.5647222 | 22.6872222 | 36 | 810 |
| Ollamae | city | Saaremaa | Estonia | 58.4563889 | 23.013889 | 26 | 1045 |
| Ollamyae | city | Saaremaa | Estonia | 58.4563889 | 23.013889 | 26 | 1045 |
| Ollamäe | city | Saaremaa | Estonia | 58.4563889 | 23.013889 | 26 | 1045 |
| Oorema | city | Saaremaa | Estonia | 58.3883333 | 22.2838889 | 121 | 1097 |
| Ooremaa | city | Saaremaa | Estonia | 58.3883333 | 22.2838889 | 121 | 1097 |
| Ooriku | city | Saaremaa | Estonia | 58.5777778 | 22.93 | 29 | 1026 |
| Oovere | city | Saaremaa | Estonia | 58.4155556 | 22.9766667 | 45 | 836 |
| Orema | city | Saaremaa | Estonia | 58.3883333 | 22.2838889 | 121 | 1097 |
| Orikula | city | Saaremaa | Estonia | 58.3205556 | 22.3230556 | 16 | 1100 |
| Orikula Asundus | city | Saaremaa | Estonia | 58.3205556 | 22.3230556 | 16 | 1100 |
| Oriküla | city | Saaremaa | Estonia | 58.3205556 | 22.3230556 | 16 | 1100 |
| Oriküla Asundus | city | Saaremaa | Estonia | 58.3205556 | 22.3230556 | 16 | 1100 |
| Orinomme | city | Saaremaa | Estonia | 58.5766667 | 23.0363889 | 19 | 829 |
| Orinymme | city | Saaremaa | Estonia | 58.5766667 | 23.0363889 | 19 | 829 |
| Orinõmme | city | Saaremaa | Estonia | 58.5766667 | 23.0363889 | 19 | 829 |
| Orisaara | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orisaare | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orisar | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orisare | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orissaar | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orissaare | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orissare | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orrisar | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orrissaar | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Orrissar | city | Saaremaa | Estonia | 58.5597222 | 23.0930556 | 13 | 756 |
| Oti | city | Saaremaa | Estonia | 58.5002778 | 23.0533333 | 16 | 1017 |
| Oti Asundus | city | Saaremaa | Estonia | 58.5002778 | 23.0533333 | 16 | 1017 |
| Oyna | city | Saaremaa | Estonia | 58.5672222 | 23.3322222 | 45 | 751 |
| Oytme | city | Saaremaa | Estonia | 58.5655556 | 22.7391667 | 29 | 835 |
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