| Fiumicino to Oerlinghausen | 724.38 mi (1,165.77 km) |
| Fiumicino to Oestrich-Winkel | 603.95 mi (971.96 km) |
| Fiumicino to Offenburg | 507.98 mi (817.51 km) |
| Fiumicino to Oftersheim | 554.05 mi (891.66 km) |
| Fiumicino to Ohrdruf | 630.13 mi (1,014.10 km) |
| Fiumicino to Ohringen | 530.29 mi (853.42 km) |
| Fiumicino to Olbernhau | 617.16 mi (993.22 km) |
| Fiumicino to Olching | 446.74 mi (718.96 km) |
| Fiumicino to Oldenburg | 807.87 mi (1,300.15 km) |
| Fiumicino to Oldenburg in Holstein | 868.17 mi (1,397.18 km) |
| Fiumicino to Olfen | 724.40 mi (1,165.82 km) |
| Fiumicino to Olpe | 672.32 mi (1,081.99 km) |
| Fiumicino to Olsberg | 685.45 mi (1,103.13 km) |
| Fiumicino to Oranienburg | 760.61 mi (1,224.09 km) |
| Fiumicino to Ortenberg | 612.54 mi (985.79 km) |
