| Barstow to Oerlinghausen | 5,601.59 mi (9,014.88 km) |
| Barstow to Oestrich-Winkel | 5,682.10 mi (9,144.45 km) |
| Barstow to Offenburg | 5,758.00 mi (9,266.60 km) |
| Barstow to Oftersheim | 5,731.83 mi (9,224.49 km) |
| Barstow to Ohrdruf | 5,719.54 mi (9,204.72 km) |
| Barstow to Ohringen | 5,768.15 mi (9,282.93 km) |
| Barstow to Olbernhau | 5,800.99 mi (9,335.80 km) |
| Barstow to Olching | 5,874.60 mi (9,454.26 km) |
| Barstow to Oldenburg | 5,528.86 mi (8,897.85 km) |
| Barstow to Oldenburg in Holstein | 5,542.44 mi (8,919.69 km) |
| Barstow to Olfen | 5,576.99 mi (8,975.30 km) |
| Barstow to Olpe | 5,625.57 mi (9,053.48 km) |
| Barstow to Olsberg | 5,627.73 mi (9,056.96 km) |
| Barstow to Oranienburg | 5,686.37 mi (9,151.33 km) |
| Barstow to Ortenberg | 5,695.37 mi (9,165.81 km) |
