| Horbury to Orbetello | 970.97 mi (1,562.62 km) |
| Horbury to Oria | 1,273.50 mi (2,049.50 km) |
| Horbury to Oristano | 1,062.25 mi (1,709.53 km) |
| Horbury to Orta Nova | 1,166.74 mi (1,877.69 km) |
| Horbury to Orte | 1,002.96 mi (1,614.11 km) |
| Horbury to Ortona | 1,069.79 mi (1,721.67 km) |
| Horbury to Orvieto | 980.32 mi (1,577.67 km) |
| Horbury to Orzinuovi | 767.01 mi (1,234.38 km) |
| Horbury to Osimo | 979.58 mi (1,576.49 km) |
| Horbury to Ospitaletto | 762.77 mi (1,227.56 km) |
| Horbury to Ostuni | 1,259.21 mi (2,026.50 km) |
| Horbury to Ottaviano | 1,155.89 mi (1,860.23 km) |
| Horbury to Ovada | 773.64 mi (1,245.06 km) |
| Horbury to Ozieri | 1,028.28 mi (1,654.86 km) |
| Horbury to Paceco | 1,273.28 mi (2,049.15 km) |
