| Hopatcong to Oberkirch | 3,892.37 mi (6,264.17 km) |
| Hopatcong to Obernburg am Main | 3,896.22 mi (6,270.37 km) |
| Hopatcong to Obernkirchen | 3,824.73 mi (6,155.30 km) |
| Hopatcong to Oberschleissheim | 4,043.77 mi (6,507.82 km) |
| Hopatcong to Oberstdorf | 4,018.02 mi (6,466.37 km) |
| Hopatcong to Obertraubling | 4,044.87 mi (6,509.59 km) |
| Hopatcong to Obertshausen | 3,877.12 mi (6,239.62 km) |
| Hopatcong to Oberursel | 3,862.83 mi (6,216.62 km) |
| Hopatcong to Ochsenfurt | 3,939.11 mi (6,339.39 km) |
| Hopatcong to Ochsenhausen | 3,983.29 mi (6,410.49 km) |
| Hopatcong to Ochtrup | 3,751.64 mi (6,037.69 km) |
| Hopatcong to Odenthal | 3,780.84 mi (6,084.68 km) |
| Hopatcong to Oelde | 3,799.31 mi (6,114.40 km) |
| Hopatcong to Oelsnitz | 3,998.61 mi (6,435.14 km) |
| Hopatcong to Oer-Erkenschwick | 3,769.34 mi (6,066.17 km) |
