| Cologno Monzese to Oberkirch | 215.09 mi (346.15 km) |
| Cologno Monzese to Obernburg am Main | 297.96 mi (479.52 km) |
| Cologno Monzese to Obernkirchen | 465.59 mi (749.30 km) |
| Cologno Monzese to Oberschleissheim | 216.84 mi (348.98 km) |
| Cologno Monzese to Oberstdorf | 138.42 mi (222.77 km) |
| Cologno Monzese to Obertraubling | 273.37 mi (439.94 km) |
| Cologno Monzese to Obertshausen | 314.23 mi (505.70 km) |
| Cologno Monzese to Oberursel | 324.62 mi (522.42 km) |
| Cologno Monzese to Ochsenfurt | 287.12 mi (462.07 km) |
| Cologno Monzese to Ochsenhausen | 178.58 mi (287.39 km) |
| Cologno Monzese to Ochtrup | 470.94 mi (757.91 km) |
| Cologno Monzese to Odenthal | 393.06 mi (632.57 km) |
| Cologno Monzese to Oelde | 438.63 mi (705.90 km) |
| Cologno Monzese to Oelsnitz | 363.13 mi (584.40 km) |
| Cologno Monzese to Oer-Erkenschwick | 432.41 mi (695.89 km) |
