| Castellbisbal to Oberkirch | 571.02 mi (918.96 km) |
| Castellbisbal to Obernburg am Main | 672.67 mi (1,082.55 km) |
| Castellbisbal to Obernkirchen | 817.19 mi (1,315.14 km) |
| Castellbisbal to Oberschleissheim | 661.86 mi (1,065.16 km) |
| Castellbisbal to Oberstdorf | 578.64 mi (931.24 km) |
| Castellbisbal to Obertraubling | 715.32 mi (1,151.20 km) |
| Castellbisbal to Obertshausen | 678.50 mi (1,091.93 km) |
| Castellbisbal to Oberursel | 680.76 mi (1,095.58 km) |
| Castellbisbal to Ochsenfurt | 686.04 mi (1,104.07 km) |
| Castellbisbal to Ochsenhausen | 599.61 mi (964.98 km) |
| Castellbisbal to Ochtrup | 780.58 mi (1,256.22 km) |
| Castellbisbal to Odenthal | 703.95 mi (1,132.90 km) |
| Castellbisbal to Oelde | 772.36 mi (1,242.99 km) |
| Castellbisbal to Oelsnitz | 786.50 mi (1,265.75 km) |
| Castellbisbal to Oer-Erkenschwick | 745.14 mi (1,199.19 km) |
