| Castelli Calepio to Oerlinghausen | 441.16 mi (709.98 km) |
| Castelli Calepio to Oestrich-Winkel | 314.30 mi (505.81 km) |
| Castelli Calepio to Offenburg | 216.54 mi (348.49 km) |
| Castelli Calepio to Oftersheim | 265.41 mi (427.13 km) |
| Castelli Calepio to Ohrdruf | 360.96 mi (580.91 km) |
| Castelli Calepio to Ohringen | 247.14 mi (397.74 km) |
| Castelli Calepio to Olbernhau | 381.99 mi (614.75 km) |
| Castelli Calepio to Olching | 189.52 mi (305.00 km) |
| Castelli Calepio to Oldenburg | 524.40 mi (843.95 km) |
| Castelli Calepio to Oldenburg in Holstein | 600.39 mi (966.23 km) |
| Castelli Calepio to Olfen | 435.65 mi (701.12 km) |
| Castelli Calepio to Olpe | 383.84 mi (617.73 km) |
| Castelli Calepio to Olsberg | 400.26 mi (644.15 km) |
| Castelli Calepio to Oranienburg | 514.43 mi (827.89 km) |
| Castelli Calepio to Ortenberg | 328.62 mi (528.86 km) |
