| Castellamonte to Oerlinghausen | 457.03 mi (735.51 km) |
| Castellamonte to Oestrich-Winkel | 319.35 mi (513.95 km) |
| Castellamonte to Offenburg | 213.39 mi (343.41 km) |
| Castellamonte to Oftersheim | 278.59 mi (448.34 km) |
| Castellamonte to Ohrdruf | 401.18 mi (645.64 km) |
| Castellamonte to Ohringen | 276.76 mi (445.41 km) |
| Castellamonte to Olbernhau | 447.82 mi (720.70 km) |
| Castellamonte to Olching | 258.76 mi (416.43 km) |
| Castellamonte to Oldenburg | 536.77 mi (863.85 km) |
| Castellamonte to Oldenburg in Holstein | 632.00 mi (1,017.11 km) |
| Castellamonte to Olfen | 437.94 mi (704.80 km) |
| Castellamonte to Olpe | 389.36 mi (626.61 km) |
| Castellamonte to Olsberg | 413.86 mi (666.04 km) |
| Castellamonte to Oranienburg | 567.06 mi (912.60 km) |
| Castellamonte to Ortenberg | 349.23 mi (562.04 km) |
