| Montemor-o-Velho to Oberkirch | 1,006.62 mi (1,620.00 km) |
| Montemor-o-Velho to Obernburg am Main | 1,093.03 mi (1,759.06 km) |
| Montemor-o-Velho to Obernkirchen | 1,186.85 mi (1,910.06 km) |
| Montemor-o-Velho to Oberschleissheim | 1,142.91 mi (1,839.34 km) |
| Montemor-o-Velho to Oberstdorf | 1,066.13 mi (1,715.76 km) |
| Montemor-o-Velho to Obertraubling | 1,187.08 mi (1,910.42 km) |
| Montemor-o-Velho to Obertshausen | 1,089.55 mi (1,753.46 km) |
| Montemor-o-Velho to Oberursel | 1,085.08 mi (1,746.27 km) |
| Montemor-o-Velho to Ochsenfurt | 1,122.39 mi (1,806.31 km) |
| Montemor-o-Velho to Ochsenhausen | 1,069.37 mi (1,720.99 km) |
| Montemor-o-Velho to Ochtrup | 1,121.37 mi (1,804.67 km) |
| Montemor-o-Velho to Odenthal | 1,066.77 mi (1,716.79 km) |
| Montemor-o-Velho to Oelde | 1,136.03 mi (1,828.26 km) |
| Montemor-o-Velho to Oelsnitz | 1,229.54 mi (1,978.75 km) |
| Montemor-o-Velho to Oer-Erkenschwick | 1,097.89 mi (1,766.88 km) |
