| Fergus Falls to Olympia Heights (Florida) | 1,663.93 mi (2,677.83 km) |
| Fergus Falls to Omaha (Nebraska) | 347.04 mi (558.50 km) |
| Fergus Falls to On Top of the World Designated Place (Florida) | 1,401.54 mi (2,255.56 km) |
| Fergus Falls to Onalaska (Wisconsin) | 289.45 mi (465.82 km) |
| Fergus Falls to Oneida (New York) | 1,024.00 mi (1,647.97 km) |
| Fergus Falls to Oneonta (New York) | 1,067.37 mi (1,717.77 km) |
| Fergus Falls to Ontario (California) | 1,409.45 mi (2,268.29 km) |
| Fergus Falls to Ontario (Oregon) | 1,027.14 mi (1,653.02 km) |
| Fergus Falls to Opa-locka (Florida) | 1,655.56 mi (2,664.37 km) |
| Fergus Falls to Opelika (Alabama) | 1,098.49 mi (1,767.85 km) |
| Fergus Falls to Opelousas (Louisiana) | 1,109.80 mi (1,786.06 km) |
| Fergus Falls to Orange (California) | 1,429.61 mi (2,300.73 km) |
| Fergus Falls to Orange (Texas) | 1,123.66 mi (1,808.35 km) |
| Fergus Falls to Orange City (Florida) | 1,441.15 mi (2,319.30 km) |
| Fergus Falls to Orangeburg (South Carolina) | 1,192.21 mi (1,918.68 km) |
