| Valongo to Octeville | 670.90 mi (1,079.71 km) |
| Valongo to Oignies | 845.30 mi (1,360.38 km) |
| Valongo to Oissel | 730.47 mi (1,175.58 km) |
| Valongo to Olivet | 688.51 mi (1,108.04 km) |
| Valongo to Ollioules | 746.14 mi (1,200.80 km) |
| Valongo to Olonne-sur-Mer | 498.73 mi (802.63 km) |
| Valongo to Oloron-Sainte-Marie | 427.10 mi (687.35 km) |
| Valongo to Onet Village | 603.45 mi (971.16 km) |
| Valongo to Onnaing | 860.55 mi (1,384.92 km) |
| Valongo to Orange | 705.49 mi (1,135.37 km) |
| Valongo to Orchies | 853.42 mi (1,373.44 km) |
| Valongo to Orleans | 690.46 mi (1,111.20 km) |
| Valongo to Orly | 744.58 mi (1,198.28 km) |
| Valongo to Ormesson-sur-Marne | 751.50 mi (1,209.42 km) |
| Valongo to Orsay | 735.42 mi (1,183.54 km) |
