| Milford Haven to Oerlinghausen | 584.64 mi (940.89 km) |
| Milford Haven to Oestrich-Winkel | 580.22 mi (933.78 km) |
| Milford Haven to Offenburg | 616.37 mi (991.95 km) |
| Milford Haven to Oftersheim | 618.86 mi (995.96 km) |
| Milford Haven to Ohrdruf | 683.33 mi (1,099.71 km) |
| Milford Haven to Ohringen | 661.63 mi (1,064.78 km) |
| Milford Haven to Olbernhau | 796.89 mi (1,282.47 km) |
| Milford Haven to Olching | 764.73 mi (1,230.71 km) |
| Milford Haven to Oldenburg | 566.30 mi (911.37 km) |
| Milford Haven to Oldenburg in Holstein | 684.14 mi (1,101.02 km) |
| Milford Haven to Olfen | 531.29 mi (855.03 km) |
| Milford Haven to Olpe | 556.81 mi (896.09 km) |
| Milford Haven to Olsberg | 581.08 mi (935.15 km) |
| Milford Haven to Oranienburg | 774.72 mi (1,246.80 km) |
| Milford Haven to Ortenberg | 618.69 mi (995.68 km) |
