| Tortosa to Olympia Heights (Florida) | 4,623.83 mi (7,441.34 km) |
| Tortosa to Omaha (Nebraska) | 4,735.39 mi (7,620.87 km) |
| Tortosa to On Top of the World Designated Place (Florida) | 4,586.23 mi (7,380.82 km) |
| Tortosa to Onalaska (Wisconsin) | 4,429.56 mi (7,128.69 km) |
| Tortosa to Oneida (New York) | 3,776.72 mi (6,078.04 km) |
| Tortosa to Oneonta (New York) | 3,768.20 mi (6,064.33 km) |
| Tortosa to Ontario (California) | 5,940.33 mi (9,560.04 km) |
| Tortosa to Ontario (Oregon) | 5,409.25 mi (8,705.35 km) |
| Tortosa to Opa-locka (Florida) | 4,612.53 mi (7,423.15 km) |
| Tortosa to Opelika (Alabama) | 4,596.65 mi (7,397.59 km) |
| Tortosa to Opelousas (Louisiana) | 5,002.39 mi (8,050.56 km) |
| Tortosa to Orange (California) | 5,960.69 mi (9,592.80 km) |
| Tortosa to Orange (Texas) | 5,098.53 mi (8,205.29 km) |
| Tortosa to Orange City (Florida) | 4,543.48 mi (7,312.02 km) |
| Tortosa to Orangeburg (South Carolina) | 4,347.58 mi (6,996.76 km) |
