| Romilly-sur-Seine to Olympia Heights (Florida) | 4,645.91 mi (7,476.87 km) |
| Romilly-sur-Seine to Omaha (Nebraska) | 4,548.23 mi (7,319.66 km) |
| Romilly-sur-Seine to On Top of the World Designated Place (Florida) | 4,569.25 mi (7,353.50 km) |
| Romilly-sur-Seine to Onalaska (Wisconsin) | 4,244.18 mi (6,830.34 km) |
| Romilly-sur-Seine to Oneida (New York) | 3,667.25 mi (5,901.88 km) |
| Romilly-sur-Seine to Oneonta (New York) | 3,667.66 mi (5,902.52 km) |
| Romilly-sur-Seine to Ontario (California) | 5,686.73 mi (9,151.91 km) |
| Romilly-sur-Seine to Ontario (Oregon) | 5,105.43 mi (8,216.40 km) |
| Romilly-sur-Seine to Opa-locka (Florida) | 4,633.70 mi (7,457.22 km) |
| Romilly-sur-Seine to Opelika (Alabama) | 4,532.92 mi (7,295.03 km) |
| Romilly-sur-Seine to Opelousas (Louisiana) | 4,917.40 mi (7,913.79 km) |
| Romilly-sur-Seine to Orange (California) | 5,707.14 mi (9,184.75 km) |
| Romilly-sur-Seine to Orange (Texas) | 5,006.82 mi (8,057.69 km) |
| Romilly-sur-Seine to Orange City (Florida) | 4,533.75 mi (7,296.37 km) |
| Romilly-sur-Seine to Orangeburg (South Carolina) | 4,301.81 mi (6,923.10 km) |
