| Castellamonte to Oberkirch | 218.44 mi (351.54 km) |
| Castellamonte to Obernburg am Main | 315.11 mi (507.13 km) |
| Castellamonte to Obernkirchen | 479.92 mi (772.36 km) |
| Castellamonte to Oberschleissheim | 269.16 mi (433.18 km) |
| Castellamonte to Oberstdorf | 185.97 mi (299.29 km) |
| Castellamonte to Obertraubling | 324.06 mi (521.53 km) |
| Castellamonte to Obertshausen | 327.84 mi (527.61 km) |
| Castellamonte to Oberursel | 335.52 mi (539.97 km) |
| Castellamonte to Ochsenfurt | 314.65 mi (506.39 km) |
| Castellamonte to Ochsenhausen | 213.90 mi (344.24 km) |
| Castellamonte to Ochtrup | 472.06 mi (759.71 km) |
| Castellamonte to Odenthal | 391.42 mi (629.94 km) |
| Castellamonte to Oelde | 446.19 mi (718.07 km) |
| Castellamonte to Oelsnitz | 404.29 mi (650.64 km) |
| Castellamonte to Oer-Erkenschwick | 433.05 mi (696.93 km) |
