| Grand Forks to Orbetello | 4,821.59 mi (7,759.60 km) |
| Grand Forks to Oria | 5,140.53 mi (8,272.88 km) |
| Grand Forks to Oristano | 4,856.72 mi (7,816.14 km) |
| Grand Forks to Orta Nova | 5,032.24 mi (8,098.61 km) |
| Grand Forks to Orte | 4,860.88 mi (7,822.82 km) |
| Grand Forks to Ortona | 4,934.83 mi (7,941.85 km) |
| Grand Forks to Orvieto | 4,838.25 mi (7,786.41 km) |
| Grand Forks to Orzinuovi | 4,629.22 mi (7,450.00 km) |
| Grand Forks to Osimo | 4,845.45 mi (7,798.00 km) |
| Grand Forks to Ospitaletto | 4,626.23 mi (7,445.20 km) |
| Grand Forks to Ostuni | 5,126.38 mi (8,250.12 km) |
| Grand Forks to Ottaviano | 5,015.73 mi (8,072.04 km) |
| Grand Forks to Ovada | 4,622.91 mi (7,439.85 km) |
| Grand Forks to Ozieri | 4,837.43 mi (7,785.09 km) |
| Grand Forks to Paceco | 5,097.94 mi (8,204.34 km) |
