| Castel San Giorgio to Oberkirch | 625.93 mi (1,007.34 km) |
| Castel San Giorgio to Obernburg am Main | 681.08 mi (1,096.10 km) |
| Castel San Giorgio to Obernkirchen | 835.98 mi (1,345.38 km) |
| Castel San Giorgio to Oberschleissheim | 538.37 mi (866.43 km) |
| Castel San Giorgio to Oberstdorf | 507.47 mi (816.69 km) |
| Castel San Giorgio to Obertraubling | 578.71 mi (931.34 km) |
| Castel San Giorgio to Obertshausen | 701.14 mi (1,128.37 km) |
| Castel San Giorgio to Oberursel | 714.64 mi (1,150.10 km) |
| Castel San Giorgio to Ochsenfurt | 652.49 mi (1,050.08 km) |
| Castel San Giorgio to Ochsenhausen | 555.25 mi (893.58 km) |
| Castel San Giorgio to Ochtrup | 865.16 mi (1,392.35 km) |
| Castel San Giorgio to Odenthal | 795.54 mi (1,280.29 km) |
| Castel San Giorgio to Oelde | 824.18 mi (1,326.39 km) |
| Castel San Giorgio to Oelsnitz | 676.67 mi (1,088.99 km) |
| Castel San Giorgio to Oer-Erkenschwick | 829.49 mi (1,334.93 km) |
