| Treviglio to Oerlinghausen | 447.31 mi (719.88 km) |
| Treviglio to Oestrich-Winkel | 318.14 mi (512.00 km) |
| Treviglio to Offenburg | 218.00 mi (350.83 km) |
| Treviglio to Oftersheim | 270.09 mi (434.66 km) |
| Treviglio to Ohrdruf | 370.39 mi (596.08 km) |
| Treviglio to Ohringen | 254.20 mi (409.10 km) |
| Treviglio to Olbernhau | 395.07 mi (635.80 km) |
| Treviglio to Olching | 202.19 mi (325.39 km) |
| Treviglio to Oldenburg | 530.28 mi (853.41 km) |
| Treviglio to Oldenburg in Holstein | 609.23 mi (980.46 km) |
| Treviglio to Olfen | 439.73 mi (707.68 km) |
| Treviglio to Olpe | 388.18 mi (624.72 km) |
| Treviglio to Olsberg | 405.90 mi (653.24 km) |
| Treviglio to Oranienburg | 526.02 mi (846.55 km) |
| Treviglio to Ortenberg | 334.95 mi (539.05 km) |
