| Fairmont to Olympia Heights (Florida) | 950.29 mi (1,529.34 km) |
| Fairmont to Omaha (Nebraska) | 845.01 mi (1,359.91 km) |
| Fairmont to On Top of the World Designated Place (Florida) | 726.81 mi (1,169.69 km) |
| Fairmont to Onalaska (Wisconsin) | 646.17 mi (1,039.91 km) |
| Fairmont to Oneida (New York) | 340.71 mi (548.32 km) |
| Fairmont to Oneonta (New York) | 335.54 mi (540.00 km) |
| Fairmont to Ontario (California) | 2,091.81 mi (3,366.44 km) |
| Fairmont to Ontario (Oregon) | 1,907.87 mi (3,070.42 km) |
| Fairmont to Opa-locka (Florida) | 938.11 mi (1,509.74 km) |
| Fairmont to Opelika (Alabama) | 553.82 mi (891.29 km) |
| Fairmont to Opelousas (Louisiana) | 914.22 mi (1,471.29 km) |
| Fairmont to Orange (California) | 2,109.28 mi (3,394.56 km) |
| Fairmont to Orange (Texas) | 1,004.96 mi (1,617.33 km) |
| Fairmont to Orange City (Florida) | 731.26 mi (1,176.86 km) |
| Fairmont to Orangeburg (South Carolina) | 415.37 mi (668.47 km) |
