| Viseu to Nuth | 968.27 mi (1,558.28 km) |
| Viseu to Oegstgeest | 987.54 mi (1,589.29 km) |
| Viseu to Oirschot | 977.48 mi (1,573.09 km) |
| Viseu to Oisterwijk | 978.51 mi (1,574.76 km) |
| Viseu to Oldebroek | 1,042.12 mi (1,677.13 km) |
| Viseu to Oldenzaal | 1,066.76 mi (1,716.78 km) |
| Viseu to Ommen | 1,060.68 mi (1,707.00 km) |
| Viseu to Oosterend | 1,074.62 mi (1,729.43 km) |
| Viseu to Oosterhout | 971.21 mi (1,563.02 km) |
| Viseu to Oosterwolde | 1,080.38 mi (1,738.70 km) |
| Viseu to Oostzaan | 1,012.13 mi (1,628.87 km) |
| Viseu to Opmeer | 1,027.81 mi (1,654.10 km) |
| Viseu to Oss | 997.07 mi (1,604.62 km) |
| Viseu to Oud-Beijerland | 966.71 mi (1,555.78 km) |
| Viseu to Oudenbosch | 958.70 mi (1,542.89 km) |
