| Somerset to Orbetello | 4,235.22 mi (6,815.93 km) |
| Somerset to Oria | 4,587.91 mi (7,383.52 km) |
| Somerset to Oristano | 4,205.44 mi (6,768.00 km) |
| Somerset to Orta Nova | 4,472.54 mi (7,197.85 km) |
| Somerset to Orte | 4,286.06 mi (6,897.75 km) |
| Somerset to Ortona | 4,377.87 mi (7,045.50 km) |
| Somerset to Orvieto | 4,264.91 mi (6,863.72 km) |
| Somerset to Orzinuovi | 4,080.01 mi (6,566.14 km) |
| Somerset to Osimo | 4,297.58 mi (6,916.28 km) |
| Somerset to Ospitaletto | 4,080.94 mi (6,567.64 km) |
| Somerset to Ostuni | 4,576.73 mi (7,365.54 km) |
| Somerset to Ottaviano | 4,436.29 mi (7,139.52 km) |
| Somerset to Ovada | 4,049.12 mi (6,516.43 km) |
| Somerset to Ozieri | 4,200.65 mi (6,760.30 km) |
| Somerset to Paceco | 4,456.17 mi (7,171.52 km) |
