| Knowsley to Oerlinghausen | 492.30 mi (792.28 km) |
| Knowsley to Oestrich-Winkel | 521.23 mi (838.84 km) |
| Knowsley to Offenburg | 581.05 mi (935.12 km) |
| Knowsley to Oftersheim | 566.75 mi (912.10 km) |
| Knowsley to Ohrdruf | 602.72 mi (969.98 km) |
| Knowsley to Ohringen | 607.58 mi (977.80 km) |
| Knowsley to Olbernhau | 712.14 mi (1,146.08 km) |
| Knowsley to Olching | 715.01 mi (1,150.70 km) |
| Knowsley to Oldenburg | 456.92 mi (735.34 km) |
| Knowsley to Oldenburg in Holstein | 561.59 mi (903.79 km) |
| Knowsley to Olfen | 445.55 mi (717.04 km) |
| Knowsley to Olpe | 481.75 mi (775.30 km) |
| Knowsley to Olsberg | 498.70 mi (802.58 km) |
| Knowsley to Oranienburg | 667.64 mi (1,074.46 km) |
| Knowsley to Ortenberg | 549.86 mi (884.91 km) |
