| Rock Ferry to Orbetello | 998.55 mi (1,607.01 km) |
| Rock Ferry to Oria | 1,310.03 mi (2,108.29 km) |
| Rock Ferry to Oristano | 1,077.94 mi (1,734.78 km) |
| Rock Ferry to Orta Nova | 1,201.49 mi (1,933.60 km) |
| Rock Ferry to Orte | 1,033.34 mi (1,663.00 km) |
| Rock Ferry to Ortona | 1,104.14 mi (1,776.94 km) |
| Rock Ferry to Orvieto | 1,010.65 mi (1,626.49 km) |
| Rock Ferry to Orzinuovi | 799.15 mi (1,286.11 km) |
| Rock Ferry to Osimo | 1,014.66 mi (1,632.93 km) |
| Rock Ferry to Ospitaletto | 795.76 mi (1,280.64 km) |
| Rock Ferry to Ostuni | 1,296.08 mi (2,085.83 km) |
| Rock Ferry to Ottaviano | 1,187.36 mi (1,910.87 km) |
| Rock Ferry to Ovada | 799.96 mi (1,287.40 km) |
| Rock Ferry to Ozieri | 1,046.30 mi (1,683.85 km) |
| Rock Ferry to Paceco | 1,295.71 mi (2,085.24 km) |
