| Forfar to Olympia Heights (Florida) | 4,280.65 mi (6,889.05 km) |
| Forfar to Omaha (Nebraska) | 4,016.10 mi (6,463.29 km) |
| Forfar to On Top of the World Designated Place (Florida) | 4,169.86 mi (6,710.75 km) |
| Forfar to Onalaska (Wisconsin) | 3,716.85 mi (5,981.70 km) |
| Forfar to Oneida (New York) | 3,207.06 mi (5,161.27 km) |
| Forfar to Oneonta (New York) | 3,214.89 mi (5,173.87 km) |
| Forfar to Ontario (California) | 5,107.16 mi (8,219.17 km) |
| Forfar to Ontario (Oregon) | 4,506.22 mi (7,252.05 km) |
| Forfar to Opa-locka (Florida) | 4,267.85 mi (6,868.45 km) |
| Forfar to Opelika (Alabama) | 4,093.82 mi (6,588.37 km) |
| Forfar to Opelousas (Louisiana) | 4,454.73 mi (7,169.20 km) |
| Forfar to Orange (California) | 5,127.47 mi (8,251.87 km) |
| Forfar to Orange (Texas) | 4,537.57 mi (7,302.51 km) |
| Forfar to Orange City (Florida) | 4,141.58 mi (6,665.24 km) |
| Forfar to Orangeburg (South Carolina) | 3,882.39 mi (6,248.11 km) |
