| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Odulemma | city | Harjumaa | Estonia | 59.1361111 | 24.3316667 | 232 | 9850 |
| Ohtra | city | Harjumaa | Estonia | 59.3333333 | 24.1166667 | 55 | 6598 |
| Ohtu | city | Harjumaa | Estonia | 59.2783333 | 24.3627778 | 137 | 9815 |
| Oismae | city | Harjumaa | Estonia | 59.4202778 | 24.6411111 | 72 | 6176 |
| Ojakula | city | Harjumaa | Estonia | 59.3336111 | 25.3655556 | 193 | 9791 |
| Ojaküla | city | Harjumaa | Estonia | 59.3336111 | 25.3655556 | 193 | 9791 |
| Ojasoo | city | Harjumaa | Estonia | 59.1230556 | 25.1847222 | 232 | 8227 |
| Okhtra | city | Harjumaa | Estonia | 59.3333333 | 24.1166667 | 55 | 6598 |
| Okhtu | city | Harjumaa | Estonia | 59.2783333 | 24.3627778 | 137 | 9815 |
| Oleviste | city | Harjumaa | Estonia | 59.4388889 | 24.75 | 72 | 6694 |
| Orava | city | Harjumaa | Estonia | 59.4580556 | 24.4005556 | 141 | 7444 |
| Oru | city | Harjumaa | Estonia | 59.1877778 | 24.9805556 | 229 | 8678 |
| Oyakyula | city | Harjumaa | Estonia | 59.3336111 | 25.3655556 | 193 | 9791 |
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