| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oini | city | Nomos Kastorias | Greece | 40.5177778 | 21.0880556 | 2244 | 3598 |
| Oinoi | city | Nomos Kastorias | Greece | 40.5177778 | 21.0880556 | 2244 | 3598 |
| Oinói | city | Nomos Kastorias | Greece | 40.5177778 | 21.0880556 | 2244 | 3598 |
| Oińï | city | Nomos Kastorias | Greece | 40.5177778 | 21.0880556 | 2244 | 3598 |
| Omorfokklisia | city | Nomos Kastorias | Greece | 40.4269444 | 21.1172222 | 2916 | 3532 |
| Omorfokklisiá | city | Nomos Kastorias | Greece | 40.4269444 | 21.1172222 | 2916 | 3532 |
| Osiani | city | Nomos Kastorias | Greece | 40.5177778 | 21.0880556 | 2244 | 3598 |
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