| Viseu to Octeville | 689.87 mi (1,110.24 km) |
| Viseu to Oignies | 856.73 mi (1,378.77 km) |
| Viseu to Oissel | 742.47 mi (1,194.89 km) |
| Viseu to Olivet | 694.09 mi (1,117.03 km) |
| Viseu to Ollioules | 727.19 mi (1,170.30 km) |
| Viseu to Olonne-sur-Mer | 508.53 mi (818.41 km) |
| Viseu to Oloron-Sainte-Marie | 414.15 mi (666.51 km) |
| Viseu to Onet Village | 592.54 mi (953.61 km) |
| Viseu to Onnaing | 870.74 mi (1,401.32 km) |
| Viseu to Orange | 691.30 mi (1,112.53 km) |
| Viseu to Orchies | 864.43 mi (1,391.16 km) |
| Viseu to Orleans | 696.17 mi (1,120.38 km) |
| Viseu to Orly | 752.16 mi (1,210.49 km) |
| Viseu to Ormesson-sur-Marne | 758.94 mi (1,221.40 km) |
| Viseu to Orsay | 743.25 mi (1,196.15 km) |
