| Melksham to Orbetello | 879.47 mi (1,415.37 km) |
| Melksham to Oria | 1,204.47 mi (1,938.40 km) |
| Melksham to Oristano | 944.50 mi (1,520.03 km) |
| Melksham to Orta Nova | 1,093.08 mi (1,759.14 km) |
| Melksham to Orte | 918.36 mi (1,477.96 km) |
| Melksham to Ortona | 995.55 mi (1,602.19 km) |
| Melksham to Orvieto | 895.76 mi (1,441.58 km) |
| Melksham to Orzinuovi | 689.23 mi (1,109.21 km) |
| Melksham to Osimo | 908.05 mi (1,461.37 km) |
| Melksham to Ospitaletto | 687.39 mi (1,106.26 km) |
| Melksham to Ostuni | 1,191.22 mi (1,917.09 km) |
| Melksham to Ottaviano | 1,073.31 mi (1,727.32 km) |
| Melksham to Ovada | 680.54 mi (1,095.22 km) |
| Melksham to Ozieri | 915.17 mi (1,472.82 km) |
| Melksham to Paceco | 1,168.60 mi (1,880.68 km) |
