| Viana do Castelo to Oberkirch | 947.35 mi (1,524.61 km) |
| Viana do Castelo to Obernburg am Main | 1,028.76 mi (1,655.64 km) |
| Viana do Castelo to Obernkirchen | 1,112.11 mi (1,789.77 km) |
| Viana do Castelo to Oberschleissheim | 1,090.61 mi (1,755.17 km) |
| Viana do Castelo to Oberstdorf | 1,016.95 mi (1,636.62 km) |
| Viana do Castelo to Obertraubling | 1,131.75 mi (1,821.38 km) |
| Viana do Castelo to Obertshausen | 1,023.65 mi (1,647.41 km) |
| Viana do Castelo to Oberursel | 1,018.08 mi (1,638.43 km) |
| Viana do Castelo to Ochsenfurt | 1,060.59 mi (1,706.86 km) |
| Viana do Castelo to Ochsenhausen | 1,015.83 mi (1,634.82 km) |
| Viana do Castelo to Ochtrup | 1,043.50 mi (1,679.35 km) |
| Viana do Castelo to Odenthal | 993.32 mi (1,598.59 km) |
| Viana do Castelo to Oelde | 1,061.28 mi (1,707.97 km) |
| Viana do Castelo to Oelsnitz | 1,167.18 mi (1,878.39 km) |
| Viana do Castelo to Oer-Erkenschwick | 1,022.24 mi (1,645.14 km) |
