| Barcelos to Octeville | 653.38 mi (1,051.52 km) |
| Barcelos to Oignies | 830.66 mi (1,336.83 km) |
| Barcelos to Oissel | 715.71 mi (1,151.82 km) |
| Barcelos to Olivet | 676.58 mi (1,088.85 km) |
| Barcelos to Ollioules | 746.30 mi (1,201.06 km) |
| Barcelos to Olonne-sur-Mer | 485.31 mi (781.03 km) |
| Barcelos to Oloron-Sainte-Marie | 424.89 mi (683.80 km) |
| Barcelos to Onet Village | 599.62 mi (964.99 km) |
| Barcelos to Onnaing | 846.41 mi (1,362.17 km) |
| Barcelos to Orange | 703.16 mi (1,131.62 km) |
| Barcelos to Orchies | 838.94 mi (1,350.15 km) |
| Barcelos to Orleans | 678.48 mi (1,091.91 km) |
| Barcelos to Orly | 731.69 mi (1,177.54 km) |
| Barcelos to Ormesson-sur-Marne | 738.67 mi (1,188.77 km) |
| Barcelos to Orsay | 722.43 mi (1,162.64 km) |
