| Sompting to Olympia Heights (Florida) | 4,435.42 mi (7,138.11 km) |
| Sompting to Omaha (Nebraska) | 4,308.10 mi (6,933.21 km) |
| Sompting to On Top of the World Designated Place (Florida) | 4,350.96 mi (7,002.19 km) |
| Sompting to Onalaska (Wisconsin) | 4,004.37 mi (6,444.42 km) |
| Sompting to Oneida (New York) | 3,435.98 mi (5,529.68 km) |
| Sompting to Oneonta (New York) | 3,437.63 mi (5,532.33 km) |
| Sompting to Ontario (California) | 5,444.75 mi (8,762.48 km) |
| Sompting to Ontario (Oregon) | 4,865.24 mi (7,829.84 km) |
| Sompting to Opa-locka (Florida) | 4,423.05 mi (7,118.21 km) |
| Sompting to Opelika (Alabama) | 4,306.52 mi (6,930.67 km) |
| Sompting to Opelousas (Louisiana) | 4,687.11 mi (7,543.17 km) |
| Sompting to Orange (California) | 5,465.16 mi (8,795.32 km) |
| Sompting to Orange (Texas) | 4,775.47 mi (7,685.38 km) |
| Sompting to Orange City (Florida) | 4,316.97 mi (6,947.49 km) |
| Sompting to Orangeburg (South Carolina) | 4,078.94 mi (6,564.42 km) |
