| Castano Primo to Oerlinghausen | 443.37 mi (713.54 km) |
| Castano Primo to Oestrich-Winkel | 309.51 mi (498.12 km) |
| Castano Primo to Offenburg | 205.31 mi (330.42 km) |
| Castano Primo to Oftersheim | 264.11 mi (425.05 km) |
| Castano Primo to Ohrdruf | 375.72 mi (604.66 km) |
| Castano Primo to Ohringen | 254.51 mi (409.59 km) |
| Castano Primo to Olbernhau | 411.36 mi (662.02 km) |
| Castano Primo to Olching | 219.13 mi (352.66 km) |
| Castano Primo to Oldenburg | 525.27 mi (845.35 km) |
| Castano Primo to Oldenburg in Holstein | 611.78 mi (984.56 km) |
| Castano Primo to Olfen | 430.71 mi (693.17 km) |
| Castano Primo to Olpe | 380.13 mi (611.77 km) |
| Castano Primo to Olsberg | 400.95 mi (645.27 km) |
| Castano Primo to Oranienburg | 536.94 mi (864.13 km) |
| Castano Primo to Ortenberg | 332.32 mi (534.81 km) |
