| Formia to Oerlinghausen | 775.26 mi (1,247.66 km) |
| Formia to Oestrich-Winkel | 661.15 mi (1,064.02 km) |
| Formia to Offenburg | 569.65 mi (916.76 km) |
| Formia to Oftersheim | 610.62 mi (982.70 km) |
| Formia to Ohrdruf | 674.81 mi (1,086.00 km) |
| Formia to Ohringen | 583.36 mi (938.83 km) |
| Formia to Olbernhau | 649.62 mi (1,045.46 km) |
| Formia to Olching | 492.10 mi (791.96 km) |
| Formia to Oldenburg | 858.31 mi (1,381.31 km) |
| Formia to Oldenburg in Holstein | 909.23 mi (1,463.27 km) |
| Formia to Olfen | 779.83 mi (1,255.02 km) |
| Formia to Olpe | 727.77 mi (1,171.24 km) |
| Formia to Olsberg | 738.05 mi (1,187.78 km) |
| Formia to Oranienburg | 793.92 mi (1,277.69 km) |
| Formia to Ortenberg | 664.98 mi (1,070.18 km) |
