| Barstow to Nuth | 5,572.08 mi (8,967.40 km) |
| Barstow to Oegstgeest | 5,467.12 mi (8,798.47 km) |
| Barstow to Oirschot | 5,525.64 mi (8,892.66 km) |
| Barstow to Oisterwijk | 5,518.53 mi (8,881.21 km) |
| Barstow to Oldebroek | 5,496.82 mi (8,846.28 km) |
| Barstow to Oldenzaal | 5,533.75 mi (8,905.70 km) |
| Barstow to Ommen | 5,508.70 mi (8,865.39 km) |
| Barstow to Oosterend | 5,474.38 mi (8,810.16 km) |
| Barstow to Oosterhout | 5,505.20 mi (8,859.77 km) |
| Barstow to Oosterwolde | 5,481.57 mi (8,821.73 km) |
| Barstow to Oostzaan | 5,467.47 mi (8,799.04 km) |
| Barstow to Opmeer | 5,456.46 mi (8,781.33 km) |
| Barstow to Oss | 5,519.07 mi (8,882.09 km) |
| Barstow to Oud-Beijerland | 5,482.88 mi (8,823.83 km) |
| Barstow to Oudenbosch | 5,497.70 mi (8,847.69 km) |
