| Horsell to Orbetello | 826.47 mi (1,330.08 km) |
| Horsell to Oria | 1,145.37 mi (1,843.30 km) |
| Horsell to Oristano | 903.15 mi (1,453.48 km) |
| Horsell to Orta Nova | 1,035.01 mi (1,665.69 km) |
| Horsell to Orte | 863.14 mi (1,389.09 km) |
| Horsell to Ortona | 937.47 mi (1,508.72 km) |
| Horsell to Orvieto | 840.48 mi (1,352.61 km) |
| Horsell to Orzinuovi | 631.30 mi (1,015.98 km) |
| Horsell to Osimo | 849.08 mi (1,366.47 km) |
| Horsell to Ospitaletto | 628.79 mi (1,011.94 km) |
| Horsell to Ostuni | 1,131.86 mi (1,821.55 km) |
| Horsell to Ottaviano | 1,017.76 mi (1,637.93 km) |
| Horsell to Ovada | 627.52 mi (1,009.90 km) |
| Horsell to Ozieri | 871.36 mi (1,402.31 km) |
| Horsell to Paceco | 1,121.25 mi (1,804.48 km) |
