| Grand Forks to Oberkirch | 4,414.61 mi (7,104.63 km) |
| Grand Forks to Obernburg am Main | 4,386.31 mi (7,059.09 km) |
| Grand Forks to Obernkirchen | 4,270.03 mi (6,871.95 km) |
| Grand Forks to Oberschleissheim | 4,541.65 mi (7,309.07 km) |
| Grand Forks to Oberstdorf | 4,541.41 mi (7,308.70 km) |
| Grand Forks to Obertraubling | 4,525.21 mi (7,282.62 km) |
| Grand Forks to Obertshausen | 4,365.58 mi (7,025.73 km) |
| Grand Forks to Oberursel | 4,350.85 mi (7,002.02 km) |
| Grand Forks to Ochsenfurt | 4,425.05 mi (7,121.42 km) |
| Grand Forks to Ochsenhausen | 4,498.07 mi (7,238.95 km) |
| Grand Forks to Ochtrup | 4,212.80 mi (6,779.85 km) |
| Grand Forks to Odenthal | 4,264.93 mi (6,863.74 km) |
| Grand Forks to Oelde | 4,260.28 mi (6,856.27 km) |
| Grand Forks to Oelsnitz | 4,453.44 mi (7,167.12 km) |
| Grand Forks to Oer-Erkenschwick | 4,240.85 mi (6,824.98 km) |
