| Aberdare to Oerlinghausen | 516.75 mi (831.63 km) |
| Aberdare to Oestrich-Winkel | 512.44 mi (824.69 km) |
| Aberdare to Offenburg | 551.24 mi (887.14 km) |
| Aberdare to Oftersheim | 551.72 mi (887.90 km) |
| Aberdare to Ohrdruf | 614.93 mi (989.64 km) |
| Aberdare to Ohringen | 594.40 mi (956.59 km) |
| Aberdare to Olbernhau | 728.52 mi (1,172.44 km) |
| Aberdare to Olching | 698.14 mi (1,123.55 km) |
| Aberdare to Oldenburg | 500.44 mi (805.38 km) |
| Aberdare to Oldenburg in Holstein | 620.69 mi (998.90 km) |
| Aberdare to Olfen | 463.12 mi (745.32 km) |
| Aberdare to Olpe | 488.41 mi (786.02 km) |
| Aberdare to Olsberg | 512.74 mi (825.18 km) |
| Aberdare to Oranienburg | 707.95 mi (1,139.34 km) |
| Aberdare to Ortenberg | 550.46 mi (885.87 km) |
