| Somerset to Oerlinghausen | 3,830.12 mi (6,163.99 km) |
| Somerset to Oestrich-Winkel | 3,858.81 mi (6,210.15 km) |
| Somerset to Offenburg | 3,900.55 mi (6,277.33 km) |
| Somerset to Oftersheim | 3,900.74 mi (6,277.64 km) |
| Somerset to Ohrdruf | 3,943.80 mi (6,346.94 km) |
| Somerset to Ohringen | 3,943.06 mi (6,345.74 km) |
| Somerset to Olbernhau | 4,050.65 mi (6,518.88 km) |
| Somerset to Olching | 4,048.04 mi (6,514.68 km) |
| Somerset to Oldenburg | 3,780.80 mi (6,084.61 km) |
| Somerset to Oldenburg in Holstein | 3,850.06 mi (6,196.08 km) |
| Somerset to Olfen | 3,786.59 mi (6,093.93 km) |
| Somerset to Olpe | 3,823.54 mi (6,153.39 km) |
| Somerset to Olsberg | 3,840.04 mi (6,179.95 km) |
| Somerset to Oranienburg | 3,982.51 mi (6,409.23 km) |
| Somerset to Ortenberg | 3,891.05 mi (6,262.04 km) |
