| Barstow to Oberkirch | 5,759.25 mi (9,268.62 km) |
| Barstow to Obernburg am Main | 5,724.43 mi (9,212.59 km) |
| Barstow to Obernkirchen | 5,599.13 mi (9,010.93 km) |
| Barstow to Oberschleissheim | 5,879.38 mi (9,461.95 km) |
| Barstow to Oberstdorf | 5,884.78 mi (9,470.63 km) |
| Barstow to Obertraubling | 5,858.99 mi (9,429.13 km) |
| Barstow to Obertshausen | 5,703.63 mi (9,179.10 km) |
| Barstow to Oberursel | 5,689.01 mi (9,155.58 km) |
| Barstow to Ochsenfurt | 5,761.65 mi (9,272.48 km) |
| Barstow to Ochsenhausen | 5,840.15 mi (9,398.81 km) |
| Barstow to Ochtrup | 5,546.80 mi (8,926.71 km) |
| Barstow to Odenthal | 5,603.44 mi (9,017.86 km) |
| Barstow to Oelde | 5,593.47 mi (9,001.82 km) |
| Barstow to Oelsnitz | 5,781.87 mi (9,305.02 km) |
| Barstow to Oer-Erkenschwick | 5,576.84 mi (8,975.06 km) |
