| Grand Forks to Oswego (Illinois) | 607.39 mi (977.51 km) |
| Grand Forks to Oswego (New York) | 1,036.98 mi (1,668.86 km) |
| Grand Forks to Otsego (Minnesota) | 246.48 mi (396.67 km) |
| Grand Forks to Ottawa (Illinois) | 608.24 mi (978.87 km) |
| Grand Forks to Ottawa (Kansas) | 650.53 mi (1,046.93 km) |
| Grand Forks to Ottumwa (Iowa) | 529.30 mi (851.83 km) |
| Grand Forks to Overland (Missouri) | 720.70 mi (1,159.85 km) |
| Grand Forks to Overland Park (Kansas) | 635.66 mi (1,023.00 km) |
| Grand Forks to Overlea (Maryland) | 1,180.97 mi (1,900.59 km) |
| Grand Forks to Oviedo (Florida) | 1,578.93 mi (2,541.04 km) |
| Grand Forks to Owasso (Oklahoma) | 806.35 mi (1,297.70 km) |
| Grand Forks to Owatonna (Minnesota) | 322.86 mi (519.60 km) |
| Grand Forks to Owensboro (Kentucky) | 863.52 mi (1,389.70 km) |
| Grand Forks to Owings Mills (Maryland) | 1,167.31 mi (1,878.60 km) |
| Grand Forks to Owosso (Michigan) | 711.06 mi (1,144.35 km) |
