| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| OEuf | city | Nord-Pas-de-Calais | France | 50.36 | 2.21 | 396 | 2398 |
| Oalewyne | city | Nord-Pas-de-Calais | France | 50.79 | 3.13 | 65 | 90024 |
| Oaverskerke | city | Nord-Pas-de-Calais | France | 50.64 | 2.54 | 52 | 9404 |
| Oazebroeke | city | Nord-Pas-de-Calais | France | 50.72 | 2.54 | 59 | 27634 |
| Obies | city | Nord-Pas-de-Calais | France | 50.27 | 3.79 | 830 | 8503 |
| Oblinghem | city | Nord-Pas-de-Calais | France | 50.55 | 2.60 | 82 | 42878 |
| Oblinghin | city | Nord-Pas-de-Calais | France | 50.55 | 2.60 | 82 | 42878 |
| Obrechies | city | Nord-Pas-de-Calais | France | 50.22 | 4.02 | 830 | 13682 |
| Ochtezeele | city | Nord-Pas-de-Calais | France | 50.82 | 2.40 | 137 | 5235 |
| Odomez | city | Nord-Pas-de-Calais | France | 50.45 | 3.52 | 78 | 36435 |
| Oeuf-en-Ternois | city | Nord-Pas-de-Calais | France | 50.36 | 2.21 | 396 | 2398 |
| Offekerque | city | Nord-Pas-de-Calais | France | 50.94 | 2.02 | 6 | 8960 |
| Offin | city | Nord-Pas-de-Calais | France | 50.45 | 1.94 | 219 | 3967 |
| Offrethun | city | Nord-Pas-de-Calais | France | 50.78 | 1.69 | 147 | 13054 |
| Ohain | city | Nord-Pas-de-Calais | France | 50.04 | 4.12 | 830 | 11570 |
| Oignies | city | Nord-Pas-de-Calais | France | 50.46 | 2.99 | 88 | 73563 |
| Oisy | city | Nord-Pas-de-Calais | France | 50.25 | 3.12 | 180 | 10499 |
| Oisy | city | Nord-Pas-de-Calais | France | 50.36 | 3.44 | 154 | 53896 |
| Oisy-le-Verger | city | Nord-Pas-de-Calais | France | 50.25 | 3.12 | 180 | 10499 |
| Olhain | city | Nord-Pas-de-Calais | France | 50.43 | 2.58 | 364 | 28735 |
| Olincthun | city | Nord-Pas-de-Calais | France | 50.75 | 1.66 | 285 | 50189 |
| Onglevert | city | Nord-Pas-de-Calais | France | 50.84 | 1.62 | 370 | 9156 |
| Onnaing | city | Nord-Pas-de-Calais | France | 50.39 | 3.60 | 124 | 51588 |
| Ooie | city | Nord-Pas-de-Calais | France | 50.98 | 2.04 | 6 | 9339 |
| Ooimille | city | Nord-Pas-de-Calais | France | 50.97 | 2.45 | 16 | 21411 |
| Oost-Cappel | city | Nord-Pas-de-Calais | France | 50.92 | 2.60 | 26 | 6029 |
| Oost-Kapel | city | Nord-Pas-de-Calais | France | 50.92 | 2.60 | 26 | 6029 |
| Oostcapple | city | Nord-Pas-de-Calais | France | 50.92 | 2.60 | 26 | 6029 |
| Oostkappel | city | Nord-Pas-de-Calais | France | 50.92 | 2.60 | 26 | 6029 |
| Opline | city | Nord-Pas-de-Calais | France | 50.69 | 2.92 | 55 | 51105 |
| Opperral | city | Nord-Pas-de-Calais | France | 50.83 | 2.27 | 111 | 12092 |
| Oppervald | city | Nord-Pas-de-Calais | France | 50.83 | 2.27 | 111 | 12092 |
| Oppy | city | Nord-Pas-de-Calais | France | 50.35 | 2.89 | 193 | 21005 |
| Orchies | city | Nord-Pas-de-Calais | France | 50.47 | 3.23 | 108 | 19766 |
| Orlencourt | city | Nord-Pas-de-Calais | France | 50.40 | 2.43 | 830 | 4444 |
| Ors | city | Nord-Pas-de-Calais | France | 50.10 | 3.63 | 830 | 6943 |
| Orsinval | city | Nord-Pas-de-Calais | France | 50.27 | 3.63 | 357 | 12909 |
| Orville | city | Nord-Pas-de-Calais | France | 50.13 | 2.41 | 229 | 4854 |
| Ostergnies | city | Nord-Pas-de-Calais | France | 50.27 | 4.06 | 830 | 26301 |
| Ostove | city | Nord-Pas-de-Calais | France | 50.87 | 2.09 | 13 | 9763 |
| Ostreville | city | Nord-Pas-de-Calais | France | 50.40 | 2.40 | 830 | 8091 |
| Ostricourt | city | Nord-Pas-de-Calais | France | 50.45 | 3.03 | 85 | 64077 |
| Ouderwijk | city | Nord-Pas-de-Calais | France | 50.88 | 2.08 | 16 | 9184 |
| Oudezeele | city | Nord-Pas-de-Calais | France | 50.84 | 2.51 | 111 | 8602 |
| Oulches | city | Nord-Pas-de-Calais | France | 49.43 | 3.75 | 830 | 1756 |
| Oulches-la-Vallée-Foulon | city | Nord-Pas-de-Calais | France | 49.43 | 3.75 | 830 | 1756 |
| Oundegem | city | Nord-Pas-de-Calais | France | 50.76 | 2.52 | 101 | 26451 |
| Oundschote | city | Nord-Pas-de-Calais | France | 50.98 | 2.58 | 29 | 7067 |
| Ourton | city | Nord-Pas-de-Calais | France | 50.46 | 2.48 | 830 | 34539 |
| Outkerke | city | Nord-Pas-de-Calais | France | 50.88 | 2.60 | 39 | 4869 |
| Outreau | city | Nord-Pas-de-Calais | France | 50.71 | 1.59 | 19 | 89364 |
| Outriauwe | city | Nord-Pas-de-Calais | France | 50.71 | 1.59 | 19 | 89364 |
| Outtersteene | city | Nord-Pas-de-Calais | France | 50.71 | 2.68 | 55 | 11851 |
| Ouve-Wirquin | city | Nord-Pas-de-Calais | France | 50.65 | 2.14 | 318 | 6843 |
| Oxelaere | city | Nord-Pas-de-Calais | France | 50.79 | 2.48 | 164 | 8499 |
| Oye | city | Nord-Pas-de-Calais | France | 50.98 | 2.04 | 6 | 9339 |
| Oye-Plage | city | Nord-Pas-de-Calais | France | 50.98 | 2.04 | 6 | 9339 |