| Grottaferrata to Oberkirch | 516.64 mi (831.45 km) |
| Grottaferrata to Obernburg am Main | 581.54 mi (935.90 km) |
| Grottaferrata to Obernkirchen | 742.83 mi (1,195.46 km) |
| Grottaferrata to Oberschleissheim | 449.70 mi (723.72 km) |
| Grottaferrata to Oberstdorf | 405.79 mi (653.06 km) |
| Grottaferrata to Obertraubling | 496.52 mi (799.07 km) |
| Grottaferrata to Obertshausen | 600.78 mi (966.86 km) |
| Grottaferrata to Oberursel | 613.50 mi (987.33 km) |
| Grottaferrata to Ochsenfurt | 557.44 mi (897.12 km) |
| Grottaferrata to Ochsenhausen | 454.08 mi (730.76 km) |
| Grottaferrata to Ochtrup | 764.16 mi (1,229.79 km) |
| Grottaferrata to Odenthal | 690.92 mi (1,111.93 km) |
| Grottaferrata to Oelde | 725.87 mi (1,168.17 km) |
| Grottaferrata to Oelsnitz | 596.65 mi (960.22 km) |
| Grottaferrata to Oer-Erkenschwick | 727.15 mi (1,170.23 km) |
