| Castel Mella to Oberkirch | 231.07 mi (371.87 km) |
| Castel Mella to Obernburg am Main | 303.51 mi (488.45 km) |
| Castel Mella to Obernkirchen | 469.85 mi (756.14 km) |
| Castel Mella to Oberschleissheim | 201.43 mi (324.18 km) |
| Castel Mella to Oberstdorf | 132.09 mi (212.58 km) |
| Castel Mella to Obertraubling | 257.46 mi (414.34 km) |
| Castel Mella to Obertshausen | 321.38 mi (517.21 km) |
| Castel Mella to Oberursel | 333.03 mi (535.96 km) |
| Castel Mella to Ochsenfurt | 286.76 mi (461.50 km) |
| Castel Mella to Ochsenhausen | 177.98 mi (286.43 km) |
| Castel Mella to Ochtrup | 482.35 mi (776.26 km) |
| Castel Mella to Odenthal | 406.88 mi (654.81 km) |
| Castel Mella to Oelde | 446.96 mi (719.31 km) |
| Castel Mella to Oelsnitz | 352.26 mi (566.90 km) |
| Castel Mella to Oer-Erkenschwick | 444.51 mi (715.37 km) |
