| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oceja | city | Languedoc-Roussillon | France | 42.42 | 1.98 | 4189 | 6002 |
| Octon | city | Languedoc-Roussillon | France | 43.65 | 3.30 | 830 | 1831 |
| Odeillo | city | Languedoc-Roussillon | France | 42.50 | 2.04 | 5259 | 4628 |
| Odeillo-Via | city | Languedoc-Roussillon | France | 42.50 | 2.04 | 5259 | 4628 |
| Odelló | city | Languedoc-Roussillon | France | 42.50 | 2.04 | 5259 | 4628 |
| Olargues | city | Languedoc-Roussillon | France | 43.56 | 2.91 | 830 | 1613 |
| Olette | city | Languedoc-Roussillon | France | 42.55 | 2.27 | 2509 | 533 |
| Olmet | city | Languedoc-Roussillon | France | 43.71 | 3.31 | 830 | 7571 |
| Olmet-et-Villecun | city | Languedoc-Roussillon | France | 43.71 | 3.31 | 830 | 7571 |
| Olonzac | city | Languedoc-Roussillon | France | 43.28 | 2.73 | 164 | 5530 |
| Oms | city | Languedoc-Roussillon | France | 42.54 | 2.70 | 1217 | 2503 |
| Opoul | city | Languedoc-Roussillon | France | 42.87 | 2.87 | 830 | 1680 |
| Opoul-Périllos | city | Languedoc-Roussillon | France | 42.87 | 2.87 | 830 | 1680 |
| Orbanyà | city | Languedoc-Roussillon | France | 42.64 | 2.30 | 3349 | 368 |
| Oreilla | city | Languedoc-Roussillon | France | 42.56 | 2.25 | 2509 | 469 |
| Ornaisons | city | Languedoc-Roussillon | France | 43.18 | 2.84 | 183 | 5523 |
| Orsan | city | Languedoc-Roussillon | France | 44.13 | 4.67 | 121 | 20257 |
| Orsans | city | Languedoc-Roussillon | France | 43.16 | 1.98 | 1112 | 1104 |
| Ortaffa | city | Languedoc-Roussillon | France | 42.58 | 2.93 | 68 | 19831 |
| Ortafà | city | Languedoc-Roussillon | France | 42.58 | 2.93 | 68 | 19831 |
| Orthoux | city | Languedoc-Roussillon | France | 43.89 | 4.02 | 239 | 3411 |
| Orthoux-Serignac-Quillan | city | Languedoc-Roussillon | France | 43.89 | 4.02 | 239 | 3411 |
| Orthoux-Sérignac-Quilhan | city | Languedoc-Roussillon | France | 43.89 | 4.02 | 239 | 3411 |
| Orthoux-Sérignac-et-Quilhan | city | Languedoc-Roussillon | France | 43.89 | 4.02 | 239 | 3411 |
| Osseja | city | Languedoc-Roussillon | France | 42.42 | 1.98 | 4189 | 6002 |
| Ouissac | city | Languedoc-Roussillon | France | 43.91 | 4.00 | 393 | 4279 |
| Oupia | city | Languedoc-Roussillon | France | 43.29 | 2.77 | 830 | 4733 |
| Ouveillan | city | Languedoc-Roussillon | France | 43.29 | 2.97 | 62 | 9055 |