| Aberbargoed to Oerlinghausen | 507.48 mi (816.71 km) |
| Aberbargoed to Oestrich-Winkel | 502.92 mi (809.37 km) |
| Aberbargoed to Offenburg | 541.96 mi (872.20 km) |
| Aberbargoed to Oftersheim | 542.23 mi (872.64 km) |
| Aberbargoed to Ohrdruf | 605.47 mi (974.41 km) |
| Aberbargoed to Ohringen | 584.91 mi (941.32 km) |
| Aberbargoed to Olbernhau | 719.08 mi (1,157.24 km) |
| Aberbargoed to Olching | 688.70 mi (1,108.36 km) |
| Aberbargoed to Oldenburg | 491.66 mi (791.25 km) |
| Aberbargoed to Oldenburg in Holstein | 612.37 mi (985.51 km) |
| Aberbargoed to Olfen | 453.77 mi (730.27 km) |
| Aberbargoed to Olpe | 478.93 mi (770.76 km) |
| Aberbargoed to Olsberg | 503.32 mi (810.02 km) |
| Aberbargoed to Oranienburg | 698.95 mi (1,124.85 km) |
| Aberbargoed to Ortenberg | 540.93 mi (870.55 km) |
