| Portugalete to Olympia Heights (Florida) | 4,407.49 mi (7,093.17 km) |
| Portugalete to Omaha (Nebraska) | 4,487.09 mi (7,221.28 km) |
| Portugalete to On Top of the World Designated Place (Florida) | 4,361.28 mi (7,018.80 km) |
| Portugalete to Onalaska (Wisconsin) | 4,181.18 mi (6,728.96 km) |
| Portugalete to Oneida (New York) | 3,535.02 mi (5,689.07 km) |
| Portugalete to Oneonta (New York) | 3,527.65 mi (5,677.20 km) |
| Portugalete to Ontario (California) | 5,689.56 mi (9,156.46 km) |
| Portugalete to Ontario (Oregon) | 5,159.13 mi (8,302.82 km) |
| Portugalete to Opa-locka (Florida) | 4,395.95 mi (7,074.60 km) |
| Portugalete to Opelika (Alabama) | 4,363.02 mi (7,021.60 km) |
| Portugalete to Opelousas (Louisiana) | 4,765.94 mi (7,670.04 km) |
| Portugalete to Orange (California) | 5,709.92 mi (9,189.23 km) |
| Portugalete to Orange (Texas) | 4,861.19 mi (7,823.32 km) |
| Portugalete to Orange City (Florida) | 4,319.94 mi (6,952.28 km) |
| Portugalete to Orangeburg (South Carolina) | 4,116.66 mi (6,625.12 km) |
