| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Οργάνη | city | Anatoliki Makedonia kai Thraki | Greece | 41.25 | 25.68 | 1922 | 1308 |
| Ορεστιάδα | city | Anatoliki Makedonia kai Thraki | Greece | 41.51 | 26.53 | 72 | 11967 |
| Ορεστιάς | city | Anatoliki Makedonia kai Thraki | Greece | 41.51 | 26.53 | 72 | 11967 |
| Ορεστινή | city | Anatoliki Makedonia kai Thraki | Greece | 41.23 | 24.82 | 1991 | 449 |
| Ορμένιο | city | Anatoliki Makedonia kai Thraki | Greece | 41.72 | 26.22 | 134 | 2266 |
| Ορμένιον | city | Anatoliki Makedonia kai Thraki | Greece | 41.72 | 26.22 | 134 | 2266 |
| Οροπέδιο | city | Anatoliki Makedonia kai Thraki | Greece | 41.34 | 24.25 | 2063 | 2536 |
| Οροπέδιον | city | Anatoliki Makedonia kai Thraki | Greece | 41.34 | 24.25 | 2063 | 2536 |
| Ορφάνι | city | Anatoliki Makedonia kai Thraki | Greece | 40.78 | 23.95 | 232 | 1720 |
| Ορφάνιο | city | Anatoliki Makedonia kai Thraki | Greece | 40.78 | 23.95 | 232 | 1720 |
| Ορφανό | city | Anatoliki Makedonia kai Thraki | Greece | 40.98 | 24.79 | 42 | 4400 |
| Ορφανόν | city | Anatoliki Makedonia kai Thraki | Greece | 40.98 | 24.79 | 42 | 4400 |
| Οφρύνιο | city | Anatoliki Makedonia kai Thraki | Greece | 40.80 | 23.92 | 377 | 1748 |
| Οχυρό | city | Anatoliki Makedonia kai Thraki | Greece | 41.30 | 23.85 | 1860 | 2065 |
| Οχυρόν | city | Anatoliki Makedonia kai Thraki | Greece | 41.30 | 23.85 | 1860 | 2065 |