| Knowsley to Oberkirch | 583.35 mi (938.81 km) |
| Knowsley to Obernburg am Main | 570.47 mi (918.09 km) |
| Knowsley to Obernkirchen | 505.30 mi (813.21 km) |
| Knowsley to Oberschleissheim | 722.38 mi (1,162.55 km) |
| Knowsley to Oberstdorf | 711.03 mi (1,144.30 km) |
| Knowsley to Obertraubling | 718.22 mi (1,155.87 km) |
| Knowsley to Obertshausen | 550.77 mi (886.38 km) |
| Knowsley to Oberursel | 536.25 mi (863.01 km) |
| Knowsley to Ochsenfurt | 612.75 mi (986.13 km) |
| Knowsley to Ochsenhausen | 669.99 mi (1,078.24 km) |
| Knowsley to Ochtrup | 427.50 mi (687.99 km) |
| Knowsley to Odenthal | 453.05 mi (729.11 km) |
| Knowsley to Oelde | 473.99 mi (762.82 km) |
| Knowsley to Oelsnitz | 671.69 mi (1,080.98 km) |
| Knowsley to Oer-Erkenschwick | 441.97 mi (711.28 km) |
