| Romsey to Orbetello | 841.25 mi (1,353.86 km) |
| Romsey to Oria | 1,167.08 mi (1,878.23 km) |
| Romsey to Oristano | 906.73 mi (1,459.25 km) |
| Romsey to Orta Nova | 1,055.47 mi (1,698.61 km) |
| Romsey to Orte | 880.33 mi (1,416.75 km) |
| Romsey to Ortona | 957.97 mi (1,541.70 km) |
| Romsey to Orvieto | 857.74 mi (1,380.39 km) |
| Romsey to Orzinuovi | 651.69 mi (1,048.80 km) |
| Romsey to Osimo | 870.69 mi (1,401.23 km) |
| Romsey to Ospitaletto | 650.00 mi (1,046.08 km) |
| Romsey to Ostuni | 1,153.90 mi (1,857.03 km) |
| Romsey to Ottaviano | 1,035.30 mi (1,666.15 km) |
| Romsey to Ovada | 642.34 mi (1,033.74 km) |
| Romsey to Ozieri | 877.14 mi (1,411.62 km) |
| Romsey to Paceco | 1,130.35 mi (1,819.11 km) |
