| Caldicot to Oerlinghausen | 488.19 mi (785.67 km) |
| Caldicot to Oestrich-Winkel | 481.67 mi (775.17 km) |
| Caldicot to Offenburg | 520.33 mi (837.39 km) |
| Caldicot to Oftersheim | 520.77 mi (838.10 km) |
| Caldicot to Ohrdruf | 585.11 mi (941.64 km) |
| Caldicot to Ohringen | 563.47 mi (906.81 km) |
| Caldicot to Olbernhau | 698.84 mi (1,124.68 km) |
| Caldicot to Olching | 667.15 mi (1,073.67 km) |
| Caldicot to Oldenburg | 474.28 mi (763.28 km) |
| Caldicot to Oldenburg in Holstein | 596.51 mi (960.00 km) |
| Caldicot to Olfen | 434.08 mi (698.58 km) |
| Caldicot to Olpe | 458.44 mi (737.79 km) |
| Caldicot to Olsberg | 483.25 mi (777.72 km) |
| Caldicot to Oranienburg | 680.71 mi (1,095.50 km) |
| Caldicot to Ortenberg | 520.02 mi (836.89 km) |
