| Prudhoe to Orbetello | 1,046.65 mi (1,684.42 km) |
| Prudhoe to Oria | 1,339.23 mi (2,155.28 km) |
| Prudhoe to Oristano | 1,146.10 mi (1,844.46 km) |
| Prudhoe to Orta Nova | 1,234.81 mi (1,987.24 km) |
| Prudhoe to Orte | 1,076.01 mi (1,731.67 km) |
| Prudhoe to Ortona | 1,138.56 mi (1,832.34 km) |
| Prudhoe to Orvieto | 1,053.47 mi (1,695.40 km) |
| Prudhoe to Orzinuovi | 839.19 mi (1,350.54 km) |
| Prudhoe to Osimo | 1,047.81 mi (1,686.29 km) |
| Prudhoe to Ospitaletto | 834.13 mi (1,342.40 km) |
| Prudhoe to Ostuni | 1,324.57 mi (2,131.69 km) |
| Prudhoe to Ottaviano | 1,227.48 mi (1,975.45 km) |
| Prudhoe to Ovada | 851.03 mi (1,369.59 km) |
| Prudhoe to Ozieri | 1,110.83 mi (1,787.72 km) |
| Prudhoe to Paceco | 1,352.50 mi (2,176.65 km) |
