| Castellon de la Plana to Olympia Heights (Florida) | 4,610.29 mi (7,419.55 km) |
| Castellon de la Plana to Omaha (Nebraska) | 4,746.19 mi (7,638.25 km) |
| Castellon de la Plana to On Top of the World Designated Place (Florida) | 4,577.22 mi (7,366.32 km) |
| Castellon de la Plana to Onalaska (Wisconsin) | 4,440.58 mi (7,146.43 km) |
| Castellon de la Plana to Oneida (New York) | 3,779.83 mi (6,083.05 km) |
| Castellon de la Plana to Oneonta (New York) | 3,770.28 mi (6,067.68 km) |
| Castellon de la Plana to Ontario (California) | 5,957.81 mi (9,588.18 km) |
| Castellon de la Plana to Ontario (Oregon) | 5,433.64 mi (8,744.60 km) |
| Castellon de la Plana to Opa-locka (Florida) | 4,599.11 mi (7,401.55 km) |
| Castellon de la Plana to Opelika (Alabama) | 4,593.03 mi (7,391.77 km) |
| Castellon de la Plana to Opelousas (Louisiana) | 5,000.67 mi (8,047.81 km) |
| Castellon de la Plana to Orange (California) | 5,978.14 mi (9,620.89 km) |
| Castellon de la Plana to Orange (Texas) | 5,097.47 mi (8,203.59 km) |
| Castellon de la Plana to Orange City (Florida) | 4,533.70 mi (7,296.28 km) |
| Castellon de la Plana to Orangeburg (South Carolina) | 4,342.27 mi (6,988.21 km) |
