| Half Moon Bay to Oberkirch | 5,764.67 mi (9,277.33 km) |
| Half Moon Bay to Obernburg am Main | 5,721.44 mi (9,207.77 km) |
| Half Moon Bay to Obernkirchen | 5,586.70 mi (8,990.93 km) |
| Half Moon Bay to Oberschleissheim | 5,874.80 mi (9,454.58 km) |
| Half Moon Bay to Oberstdorf | 5,887.55 mi (9,475.09 km) |
| Half Moon Bay to Obertraubling | 5,849.82 mi (9,414.37 km) |
| Half Moon Bay to Obertshausen | 5,700.69 mi (9,174.38 km) |
| Half Moon Bay to Oberursel | 5,686.32 mi (9,151.24 km) |
| Half Moon Bay to Ochsenfurt | 5,756.54 mi (9,264.25 km) |
| Half Moon Bay to Ochsenhausen | 5,841.46 mi (9,400.92 km) |
| Half Moon Bay to Ochtrup | 5,540.19 mi (8,916.08 km) |
| Half Moon Bay to Odenthal | 5,601.79 mi (9,015.21 km) |
| Half Moon Bay to Oelde | 5,585.58 mi (8,989.12 km) |
| Half Moon Bay to Oelsnitz | 5,767.31 mi (9,281.59 km) |
| Half Moon Bay to Oer-Erkenschwick | 5,572.34 mi (8,967.82 km) |
