| Hillsborough to Orbetello | 4,241.94 mi (6,826.74 km) |
| Hillsborough to Oria | 4,594.55 mi (7,394.21 km) |
| Hillsborough to Oristano | 4,212.42 mi (6,779.23 km) |
| Hillsborough to Orta Nova | 4,479.19 mi (7,208.56 km) |
| Hillsborough to Orte | 4,292.74 mi (6,908.51 km) |
| Hillsborough to Ortona | 4,384.49 mi (7,056.15 km) |
| Hillsborough to Orvieto | 4,271.58 mi (6,874.45 km) |
| Hillsborough to Orzinuovi | 4,086.54 mi (6,576.65 km) |
| Hillsborough to Osimo | 4,304.14 mi (6,926.85 km) |
| Hillsborough to Ospitaletto | 4,087.46 mi (6,578.13 km) |
| Hillsborough to Ostuni | 4,583.36 mi (7,376.21 km) |
| Hillsborough to Ottaviano | 4,443.02 mi (7,150.35 km) |
| Hillsborough to Ovada | 4,055.75 mi (6,527.10 km) |
| Hillsborough to Ozieri | 4,207.57 mi (6,771.43 km) |
| Hillsborough to Paceco | 4,463.15 mi (7,182.75 km) |
