| Santo Tirso to Oberkirch | 947.14 mi (1,524.27 km) |
| Santo Tirso to Obernburg am Main | 1,030.51 mi (1,658.44 km) |
| Santo Tirso to Obernkirchen | 1,118.14 mi (1,799.47 km) |
| Santo Tirso to Oberschleissheim | 1,088.02 mi (1,751.00 km) |
| Santo Tirso to Oberstdorf | 1,013.21 mi (1,630.60 km) |
| Santo Tirso to Obertraubling | 1,130.26 mi (1,818.98 km) |
| Santo Tirso to Obertshausen | 1,026.02 mi (1,651.23 km) |
| Santo Tirso to Oberursel | 1,020.88 mi (1,642.94 km) |
| Santo Tirso to Ochsenfurt | 1,061.42 mi (1,708.19 km) |
| Santo Tirso to Ochsenhausen | 1,013.61 mi (1,631.25 km) |
| Santo Tirso to Ochtrup | 1,050.84 mi (1,691.16 km) |
| Santo Tirso to Odenthal | 998.72 mi (1,607.29 km) |
| Santo Tirso to Oelde | 1,067.28 mi (1,717.62 km) |
| Santo Tirso to Oelsnitz | 1,168.29 mi (1,880.18 km) |
| Santo Tirso to Oer-Erkenschwick | 1,028.60 mi (1,655.37 km) |
