| Mackworth to Orbetello | 933.56 mi (1,502.42 km) |
| Mackworth to Oria | 1,242.50 mi (1,999.61 km) |
| Mackworth to Oristano | 1,018.64 mi (1,639.35 km) |
| Mackworth to Orta Nova | 1,134.33 mi (1,825.53 km) |
| Mackworth to Orte | 967.37 mi (1,556.84 km) |
| Mackworth to Ortona | 1,037.06 mi (1,668.99 km) |
| Mackworth to Orvieto | 944.70 mi (1,520.34 km) |
| Mackworth to Orzinuovi | 732.56 mi (1,178.94 km) |
| Mackworth to Osimo | 947.39 mi (1,524.67 km) |
| Mackworth to Ospitaletto | 728.93 mi (1,173.09 km) |
| Mackworth to Ostuni | 1,228.48 mi (1,977.05 km) |
| Mackworth to Ottaviano | 1,121.09 mi (1,804.23 km) |
| Mackworth to Ovada | 735.35 mi (1,183.44 km) |
| Mackworth to Ozieri | 985.71 mi (1,586.34 km) |
| Mackworth to Paceco | 1,232.99 mi (1,984.31 km) |
