| Oer-Erkenschwick to Octeville | 413.56 mi (665.57 km) |
| Oer-Erkenschwick to Oignies | 201.83 mi (324.82 km) |
| Oer-Erkenschwick to Oissel | 313.79 mi (505.00 km) |
| Oer-Erkenschwick to Olivet | 353.64 mi (569.13 km) |
| Oer-Erkenschwick to Ollioules | 591.11 mi (951.31 km) |
| Oer-Erkenschwick to Olonne-sur-Mer | 538.91 mi (867.30 km) |
| Oer-Erkenschwick to Oloron-Sainte-Marie | 688.78 mi (1,108.49 km) |
| Oer-Erkenschwick to Onet Village | 546.64 mi (879.74 km) |
| Oer-Erkenschwick to Onnaing | 180.86 mi (291.07 km) |
| Oer-Erkenschwick to Orange | 530.58 mi (853.89 km) |
| Oer-Erkenschwick to Orchies | 191.75 mi (308.59 km) |
| Oer-Erkenschwick to Orleans | 351.36 mi (565.46 km) |
| Oer-Erkenschwick to Orly | 293.61 mi (472.53 km) |
| Oer-Erkenschwick to Ormesson-sur-Marne | 286.88 mi (461.69 km) |
| Oer-Erkenschwick to Orsay | 302.51 mi (486.84 km) |
