| Trecate to Oerlinghausen | 451.42 mi (726.50 km) |
| Trecate to Oestrich-Winkel | 317.36 mi (510.74 km) |
| Trecate to Offenburg | 212.95 mi (342.72 km) |
| Trecate to Oftersheim | 272.13 mi (437.95 km) |
| Trecate to Ohrdruf | 383.94 mi (617.89 km) |
| Trecate to Ohringen | 262.72 mi (422.80 km) |
| Trecate to Olbernhau | 419.20 mi (674.64 km) |
| Trecate to Olching | 226.82 mi (365.04 km) |
| Trecate to Oldenburg | 533.26 mi (858.20 km) |
| Trecate to Oldenburg in Holstein | 619.99 mi (997.78 km) |
| Trecate to Olfen | 438.48 mi (705.67 km) |
| Trecate to Olpe | 387.99 mi (624.40 km) |
| Trecate to Olsberg | 408.96 mi (658.16 km) |
| Trecate to Oranienburg | 545.07 mi (877.20 km) |
| Trecate to Ortenberg | 340.44 mi (547.88 km) |
