| Tring to Olympia Heights (Florida) | 4,410.87 mi (7,098.60 km) |
| Tring to Omaha (Nebraska) | 4,260.95 mi (6,857.34 km) |
| Tring to On Top of the World Designated Place (Florida) | 4,322.02 mi (6,955.62 km) |
| Tring to Onalaska (Wisconsin) | 3,957.80 mi (6,369.46 km) |
| Tring to Oneida (New York) | 3,398.48 mi (5,469.33 km) |
| Tring to Oneonta (New York) | 3,401.13 mi (5,473.59 km) |
| Tring to Ontario (California) | 5,390.44 mi (8,675.07 km) |
| Tring to Ontario (Oregon) | 4,807.16 mi (7,736.37 km) |
| Tring to Opa-locka (Florida) | 4,398.41 mi (7,078.56 km) |
| Tring to Opelika (Alabama) | 4,272.37 mi (6,875.71 km) |
| Tring to Opelousas (Louisiana) | 4,649.98 mi (7,483.42 km) |
| Tring to Orange (California) | 5,410.84 mi (8,707.90 km) |
| Tring to Orange (Texas) | 4,737.49 mi (7,624.25 km) |
| Tring to Orange City (Florida) | 4,288.94 mi (6,902.38 km) |
| Tring to Orangeburg (South Carolina) | 4,047.26 mi (6,513.43 km) |
