| Knowsley to Orbetello | 997.52 mi (1,605.35 km) |
| Knowsley to Oria | 1,307.70 mi (2,104.54 km) |
| Knowsley to Oristano | 1,078.60 mi (1,735.84 km) |
| Knowsley to Orta Nova | 1,199.42 mi (1,930.27 km) |
| Knowsley to Orte | 1,031.90 mi (1,660.68 km) |
| Knowsley to Ortona | 1,102.12 mi (1,773.68 km) |
| Knowsley to Orvieto | 1,009.22 mi (1,624.18 km) |
| Knowsley to Orzinuovi | 797.40 mi (1,283.29 km) |
| Knowsley to Osimo | 1,012.51 mi (1,629.47 km) |
| Knowsley to Ospitaletto | 793.87 mi (1,277.61 km) |
| Knowsley to Ostuni | 1,293.69 mi (2,081.99 km) |
| Knowsley to Ottaviano | 1,185.78 mi (1,908.33 km) |
| Knowsley to Ovada | 799.05 mi (1,285.95 km) |
| Knowsley to Ozieri | 1,046.63 mi (1,684.39 km) |
| Knowsley to Paceco | 1,295.46 mi (2,084.85 km) |
