| Highland to Orbetello | 6,222.00 mi (10,013.34 km) |
| Highland to Oria | 6,533.04 mi (10,513.91 km) |
| Highland to Oristano | 6,263.36 mi (10,079.91 km) |
| Highland to Orta Nova | 6,427.00 mi (10,343.26 km) |
| Highland to Orte | 6,259.41 mi (10,073.55 km) |
| Highland to Ortona | 6,329.98 mi (10,187.11 km) |
| Highland to Orvieto | 6,236.74 mi (10,037.06 km) |
| Highland to Orzinuovi | 6,025.74 mi (9,697.50 km) |
| Highland to Osimo | 6,239.85 mi (10,042.06 km) |
| Highland to Ospitaletto | 6,022.17 mi (9,691.74 km) |
| Highland to Ostuni | 6,518.48 mi (10,490.47 km) |
| Highland to Ottaviano | 6,413.81 mi (10,322.03 km) |
| Highland to Ovada | 6,023.01 mi (9,693.11 km) |
| Highland to Ozieri | 6,243.09 mi (10,047.28 km) |
| Highland to Paceco | 6,503.06 mi (10,465.66 km) |
