UpAlphabetical listing of Places in Thessalia
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Oichalia | city | Thessalia | Greece | 39.61 | 21.98 | 383 | 5547 |
| Olimbiás | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Olympiada | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Olympias | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Omolion | city | Thessalia | Greece | 39.38 | 22.24 | 403 | 2030 |
| Omolion | city | Thessalia | Greece | 39.90 | 22.64 | 830 | 2904 |
| Omorfochori | city | Thessalia | Greece | 39.68 | 22.48 | 232 | 43214 |
| Omorfochorion | city | Thessalia | Greece | 39.68 | 22.48 | 232 | 43214 |
| Omorfokhori | city | Thessalia | Greece | 39.68 | 22.48 | 232 | 43214 |
| Omorfokhorion | city | Thessalia | Greece | 39.68 | 22.48 | 232 | 43214 |
| Omólio | city | Thessalia | Greece | 39.90 | 22.64 | 830 | 2904 |
| Oreini | city | Thessalia | Greece | 39.44 | 21.34 | 3349 | 227 |
| Orfaná | city | Thessalia | Greece | 39.40 | 22.22 | 396 | 1939 |
| Orman Chifliki | city | Thessalia | Greece | 39.69 | 22.42 | 246 | 47185 |
| Orthovouni | city | Thessalia | Greece | 39.76 | 21.47 | 1879 | 1213 |
| Orthovoúnion | city | Thessalia | Greece | 39.76 | 21.47 | 1879 | 1213 |
| Ostrovós | city | Thessalia | Greece | 39.87 | 21.47 | 1824 | 1240 |
| Othomanikó | city | Thessalia | Greece | 39.25 | 22.19 | 830 | 1776 |
| Othomanikón | city | Thessalia | Greece | 39.25 | 22.19 | 830 | 1776 |
| Ouranós | city | Thessalia | Greece | 39.62 | 21.64 | 830 | 2909 |
| Oxia | city | Thessalia | Greece | 39.36 | 21.60 | 2040 | 1495 |
| Oxilar | city | Thessalia | Greece | 39.69 | 22.32 | 285 | 15294 |
| Oxinia | city | Thessalia | Greece | 39.83 | 21.49 | 1669 | 1224 |
| Oxyneia | city | Thessalia | Greece | 39.83 | 21.49 | 1669 | 1224 |
| Oxynia | city | Thessalia | Greece | 39.83 | 21.49 | 1669 | 1224 |
| Oxyá | city | Thessalia | Greece | 39.36 | 21.60 | 2040 | 1495 |
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