| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Octon | city | Languedoc-Roussillon | France | 43.65 | 3.30 | 534 | 1831 |
| Odeillo | city | Languedoc-Roussillon | France | 42.50 | 2.03 | 5259 | 4543 |
| Odeillo-Via | city | Languedoc-Roussillon | France | 42.50 | 2.03 | 5259 | 4543 |
| Olargues | city | Languedoc-Roussillon | France | 43.55 | 2.92 | 1318 | 1635 |
| Olette | city | Languedoc-Roussillon | France | 42.55 | 2.27 | 3100 | 533 |
| Olmet | city | Languedoc-Roussillon | France | 43.72 | 3.32 | 879 | 7587 |
| Olmet-et-Villecun | city | Languedoc-Roussillon | France | 43.72 | 3.32 | 879 | 7587 |
| Olonzac | city | Languedoc-Roussillon | France | 43.27 | 2.73 | 124 | 6150 |
| Oms | city | Languedoc-Roussillon | France | 42.55 | 2.70 | 1486 | 2424 |
| Opoul | city | Languedoc-Roussillon | France | 42.87 | 2.88 | 593 | 1744 |
| Oreilla | city | Languedoc-Roussillon | France | 42.57 | 2.25 | 2828 | 513 |
| Ornaisons | city | Languedoc-Roussillon | France | 43.18 | 2.83 | 183 | 6106 |
| Orsan | city | Languedoc-Roussillon | France | 44.13 | 4.67 | 121 | 18299 |
| Orsans | city | Languedoc-Roussillon | France | 43.15 | 1.97 | 1164 | 977 |
| Ortaffa | city | Languedoc-Roussillon | France | 42.58 | 2.93 | 65 | 19831 |
| Orthoux | city | Languedoc-Roussillon | France | 43.88 | 4.02 | 209 | 3289 |
| Orthoux-Serignac-Quilhan | city | Languedoc-Roussillon | France | 43.88 | 4.02 | 209 | 3289 |
| Orthoux-Serignac-Quillan | city | Languedoc-Roussillon | France | 43.88 | 4.02 | 209 | 3289 |
| Orthoux-Serignac-et-Quilhan | city | Languedoc-Roussillon | France | 43.88 | 4.02 | 209 | 3289 |
| Osseja | city | Languedoc-Roussillon | France | 42.42 | 1.98 | 4432 | 6097 |
| Ouissac | city | Languedoc-Roussillon | France | 43.92 | 4.00 | 393 | 4089 |
| Oupia | city | Languedoc-Roussillon | France | 43.28 | 2.77 | 472 | 5536 |
| Ouveillan | city | Languedoc-Roussillon | France | 43.30 | 2.97 | 62 | 7017 |