| Castelginest to Olympia Heights (Florida) | 4,619.23 mi (7,433.94 km) |
| Castelginest to Omaha (Nebraska) | 4,654.79 mi (7,491.16 km) |
| Castelginest to On Top of the World Designated Place (Florida) | 4,567.10 mi (7,350.04 km) |
| Castelginest to Onalaska (Wisconsin) | 4,348.85 mi (6,998.80 km) |
| Castelginest to Oneida (New York) | 3,721.39 mi (5,989.00 km) |
| Castelginest to Oneonta (New York) | 3,716.07 mi (5,980.43 km) |
| Castelginest to Ontario (California) | 5,838.37 mi (9,395.94 km) |
| Castelginest to Ontario (Oregon) | 5,288.45 mi (8,510.94 km) |
| Castelginest to Opa-locka (Florida) | 4,607.56 mi (7,415.15 km) |
| Castelginest to Opelika (Alabama) | 4,560.40 mi (7,339.25 km) |
| Castelginest to Opelousas (Louisiana) | 4,959.42 mi (7,981.41 km) |
| Castelginest to Orange (California) | 5,858.78 mi (9,428.79 km) |
| Castelginest to Orange (Texas) | 5,053.34 mi (8,132.56 km) |
| Castelginest to Orange City (Florida) | 4,526.91 mi (7,285.35 km) |
| Castelginest to Orangeburg (South Carolina) | 4,317.21 mi (6,947.88 km) |
