| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oichalia | city | Thessalia | Greece | 39.61 | 21.98 | 383 | 5547 |
| Oichalía | city | Peloponnisos | Greece | 37.25 | 22.00 | 311 | 4413 |
| Oikhalía | city | Peloponnisos | Greece | 37.25 | 22.00 | 311 | 4413 |
| Oikismos Agiasmata | city | Voreio Aigaio | Greece | 38.59 | 25.94 | 1092 | 507 |
| Oikismos Lilikas | city | Voreio Aigaio | Greece | 38.21 | 26.06 | 0 | 2728 |
| Oikismós | city | Attiki | Greece | 38.15 | 23.86 | 1099 | 50794 |
| Oikismós Anthéon | city | Attiki | Greece | 38.28 | 23.91 | 830 | 3920 |
| Oikismós Lachnón | city | Attiki | Greece | 38.30 | 23.81 | 830 | 9387 |
| Oikismós Papágou | city | Attiki | Greece | 37.99 | 23.79 | 862 | 766923 |
| Oikismós Pontíon | city | Attiki | Greece | 38.15 | 23.86 | 1099 | 50794 |
| Oikismós Ágios Ioánnis | city | Voreio Aigaio | Greece | 38.21 | 26.07 | 0 | 2580 |
| Oikonomaiika | city | Dytiki Ellada | Greece | 38.15 | 22.37 | 3 | 4117 |
| Oikonomiánika | city | Peloponnisos | Greece | 36.52 | 23.05 | 0 | 3771 |
| Oini | city | Dytiki Makedonia | Greece | 40.52 | 21.08 | 2509 | 1862 |
| Oinochorion | city | Sterea Ellada | Greece | 38.70 | 22.36 | 2509 | 1074 |
| Oinochóri | city | Sterea Ellada | Greece | 38.70 | 22.36 | 2509 | 1074 |
| Oinofita | city | Sterea Ellada | Greece | 38.31 | 23.64 | 285 | 12648 |
| Oinoi | city | Dytiki Makedonia | Greece | 40.32 | 21.92 | 2532 | 5906 |
| Oinoi | city | Sterea Ellada | Greece | 38.32 | 23.61 | 416 | 14042 |
| Oinoi | city | Attiki | Greece | 38.17 | 23.42 | 951 | 2119 |
| Oinoi | city | Dytiki Ellada | Greece | 37.84 | 21.52 | 830 | 3745 |
| Oinoi | city | Dytiki Makedonia | Greece | 40.52 | 21.08 | 2509 | 1862 |
| Oinokhórion | city | Sterea Ellada | Greece | 38.70 | 22.36 | 2509 | 1074 |
| Oinousa | city | Voreio Aigaio | Greece | 38.51 | 26.22 | 0 | 776 |
| Oinousses | city | Voreio Aigaio | Greece | 38.51 | 26.22 | 0 | 776 |
| Oinoúsa | city | Kentriki Makedonia | Greece | 41.10 | 23.63 | 830 | 18374 |
| Oinoúsai | city | Voreio Aigaio | Greece | 38.51 | 26.22 | 0 | 776 |
| Oinoússa | city | Kentriki Makedonia | Greece | 41.10 | 23.63 | 830 | 18374 |
| Oinoússai | city | Voreio Aigaio | Greece | 38.51 | 26.22 | 0 | 776 |
| Oinófyta | city | Sterea Ellada | Greece | 38.31 | 23.64 | 285 | 12648 |
| Oisyme | city | Anatoliki Makedonia kai Thraki | Greece | 40.84 | 24.30 | 3 | 5055 |
| Oite | city | Sterea Ellada | Greece | 38.74 | 22.40 | 1817 | 781 |
| Oiti | city | Sterea Ellada | Greece | 38.74 | 22.40 | 1817 | 781 |
| Oitylo | city | Peloponnisos | Greece | 36.71 | 22.39 | 121 | 1515 |
| Oitylon | city | Peloponnisos | Greece | 36.71 | 22.39 | 121 | 1515 |
| Oiákion | city | Anatoliki Makedonia kai Thraki | Greece | 41.08 | 24.95 | 62 | 10403 |