| Grand Forks to Odessa (Texas) | 1,142.13 mi (1,838.08 km) |
| Grand Forks to Ogden (Utah) | 863.91 mi (1,390.33 km) |
| Grand Forks to Oildale (California) | 1,415.31 mi (2,277.72 km) |
| Grand Forks to Ojus (Florida) | 1,773.62 mi (2,854.36 km) |
| Grand Forks to Okemos (Michigan) | 712.24 mi (1,146.25 km) |
| Grand Forks to Oklahoma City (Oklahoma) | 860.75 mi (1,385.24 km) |
| Grand Forks to Okmulgee (Oklahoma) | 852.20 mi (1,371.49 km) |
| Grand Forks to Olathe (Kansas) | 634.69 mi (1,021.44 km) |
| Grand Forks to Old Jamestown (Missouri) | 713.82 mi (1,148.78 km) |
| Grand Forks to Oldsmar (Florida) | 1,575.64 mi (2,535.74 km) |
| Grand Forks to Olean (New York) | 993.47 mi (1,598.83 km) |
| Grand Forks to Olive Branch (Mississippi) | 969.78 mi (1,560.70 km) |
| Grand Forks to Olivehurst (California) | 1,362.01 mi (2,191.95 km) |
| Grand Forks to Olney (Maryland) | 1,166.50 mi (1,877.31 km) |
| Grand Forks to Olympia (Washington) | 1,200.99 mi (1,932.81 km) |
