| Castano Primo to Oberkirch | 208.62 mi (335.74 km) |
| Castano Primo to Obernburg am Main | 296.92 mi (477.85 km) |
| Castano Primo to Obernkirchen | 464.33 mi (747.27 km) |
| Castano Primo to Oberschleissheim | 228.60 mi (367.90 km) |
| Castano Primo to Oberstdorf | 147.26 mi (237.00 km) |
| Castano Primo to Obertraubling | 284.76 mi (458.27 km) |
| Castano Primo to Obertshausen | 312.09 mi (502.26 km) |
| Castano Primo to Oberursel | 321.63 mi (517.62 km) |
| Castano Primo to Ochsenfurt | 289.67 mi (466.18 km) |
| Castano Primo to Ochsenhausen | 183.00 mi (294.50 km) |
| Castano Primo to Ochtrup | 465.37 mi (748.94 km) |
| Castano Primo to Odenthal | 386.35 mi (621.77 km) |
| Castano Primo to Oelde | 435.04 mi (700.13 km) |
| Castano Primo to Oelsnitz | 371.11 mi (597.24 km) |
| Castano Primo to Oer-Erkenschwick | 426.57 mi (686.49 km) |
