| Grand Forks to Oerlinghausen | 4,270.17 mi (6,872.17 km) |
| Grand Forks to Oestrich-Winkel | 4,341.96 mi (6,987.71 km) |
| Grand Forks to Offenburg | 4,412.85 mi (7,101.80 km) |
| Grand Forks to Oftersheim | 4,390.88 mi (7,066.44 km) |
| Grand Forks to Ohrdruf | 4,388.90 mi (7,063.25 km) |
| Grand Forks to Ohringen | 4,428.68 mi (7,127.28 km) |
| Grand Forks to Olbernhau | 4,476.80 mi (7,204.72 km) |
| Grand Forks to Olching | 4,536.10 mi (7,300.15 km) |
| Grand Forks to Oldenburg | 4,201.12 mi (6,761.04 km) |
| Grand Forks to Oldenburg in Holstein | 4,226.99 mi (6,802.69 km) |
| Grand Forks to Olfen | 4,241.58 mi (6,826.16 km) |
| Grand Forks to Olpe | 4,288.61 mi (6,901.84 km) |
| Grand Forks to Olsberg | 4,293.50 mi (6,909.72 km) |
| Grand Forks to Oranienburg | 4,370.75 mi (7,034.04 km) |
| Grand Forks to Ortenberg | 4,358.85 mi (7,014.89 km) |
