| Somerset to Nuth | 3,748.19 mi (6,032.13 km) |
| Somerset to Oegstgeest | 3,659.32 mi (5,889.11 km) |
| Somerset to Oirschot | 3,709.61 mi (5,970.03 km) |
| Somerset to Oisterwijk | 3,703.48 mi (5,960.18 km) |
| Somerset to Oldebroek | 3,709.14 mi (5,969.28 km) |
| Somerset to Oldenzaal | 3,753.01 mi (6,039.88 km) |
| Somerset to Ommen | 3,727.64 mi (5,999.06 km) |
| Somerset to Oosterend | 3,701.68 mi (5,957.28 km) |
| Somerset to Oosterhout | 3,688.27 mi (5,935.70 km) |
| Somerset to Oosterwolde | 3,710.73 mi (5,971.85 km) |
| Somerset to Oostzaan | 3,669.63 mi (5,905.69 km) |
| Somerset to Opmeer | 3,665.70 mi (5,899.38 km) |
| Somerset to Oss | 3,711.41 mi (5,972.93 km) |
| Somerset to Oud-Beijerland | 3,665.71 mi (5,899.39 km) |
| Somerset to Oudenbosch | 3,676.32 mi (5,916.47 km) |
