| Calan to Oberkirch | 726.33 mi (1,168.92 km) |
| Calan to Obernburg am Main | 702.05 mi (1,129.84 km) |
| Calan to Obernkirchen | 772.52 mi (1,243.26 km) |
| Calan to Oberschleissheim | 565.87 mi (910.69 km) |
| Calan to Oberstdorf | 614.83 mi (989.47 km) |
| Calan to Obertraubling | 553.75 mi (891.17 km) |
| Calan to Obertshausen | 720.07 mi (1,158.83 km) |
| Calan to Oberursel | 733.89 mi (1,181.09 km) |
| Calan to Ochsenfurt | 658.71 mi (1,060.10 km) |
| Calan to Ochsenhausen | 636.44 mi (1,024.25 km) |
| Calan to Ochtrup | 842.60 mi (1,356.03 km) |
| Calan to Odenthal | 813.63 mi (1,309.42 km) |
| Calan to Oelde | 794.65 mi (1,278.86 km) |
| Calan to Oelsnitz | 595.00 mi (957.55 km) |
| Calan to Oer-Erkenschwick | 824.03 mi (1,326.16 km) |
