| Marlborough to Orbetello | 4,038.10 mi (6,498.70 km) |
| Marlborough to Oria | 4,390.32 mi (7,065.54 km) |
| Marlborough to Oristano | 4,010.48 mi (6,454.25 km) |
| Marlborough to Orta Nova | 4,275.00 mi (6,879.96 km) |
| Marlborough to Orte | 4,088.70 mi (6,580.13 km) |
| Marlborough to Ortona | 4,180.18 mi (6,727.35 km) |
| Marlborough to Orvieto | 4,067.49 mi (6,546.00 km) |
| Marlborough to Orzinuovi | 3,881.89 mi (6,247.31 km) |
| Marlborough to Osimo | 4,099.63 mi (6,597.71 km) |
| Marlborough to Ospitaletto | 3,882.76 mi (6,248.70 km) |
| Marlborough to Ostuni | 4,379.07 mi (7,047.44 km) |
| Marlborough to Ottaviano | 4,239.22 mi (6,822.36 km) |
| Marlborough to Ovada | 3,851.48 mi (6,198.36 km) |
| Marlborough to Ozieri | 4,005.12 mi (6,445.61 km) |
| Marlborough to Paceco | 4,261.22 mi (6,857.78 km) |
