| Caldicot to Oberkirch | 524.21 mi (843.63 km) |
| Caldicot to Obernburg am Main | 533.42 mi (858.45 km) |
| Caldicot to Obernkirchen | 507.18 mi (816.22 km) |
| Caldicot to Oberschleissheim | 676.04 mi (1,087.98 km) |
| Caldicot to Oberstdorf | 650.85 mi (1,047.44 km) |
| Caldicot to Obertraubling | 681.77 mi (1,097.21 km) |
| Caldicot to Obertshausen | 515.75 mi (830.02 km) |
| Caldicot to Oberursel | 502.26 mi (808.30 km) |
| Caldicot to Ochsenfurt | 576.77 mi (928.21 km) |
| Caldicot to Ochsenhausen | 614.86 mi (989.52 km) |
| Caldicot to Ochtrup | 425.55 mi (684.86 km) |
| Caldicot to Odenthal | 427.50 mi (688.00 km) |
| Caldicot to Oelde | 466.47 mi (750.71 km) |
| Caldicot to Oelsnitz | 652.41 mi (1,049.95 km) |
| Caldicot to Oer-Erkenschwick | 428.69 mi (689.92 km) |
