| Sanlucar la Mayor to Olympia Heights (Florida) | 4,329.84 mi (6,968.21 km) |
| Sanlucar la Mayor to Omaha (Nebraska) | 4,580.87 mi (7,372.20 km) |
| Sanlucar la Mayor to On Top of the World Designated Place (Florida) | 4,316.03 mi (6,945.97 km) |
| Sanlucar la Mayor to Onalaska (Wisconsin) | 4,278.10 mi (6,884.93 km) |
| Sanlucar la Mayor to Oneida (New York) | 3,579.66 mi (5,760.90 km) |
| Sanlucar la Mayor to Oneonta (New York) | 3,564.96 mi (5,737.26 km) |
| Sanlucar la Mayor to Ontario (California) | 5,823.71 mi (9,372.35 km) |
| Sanlucar la Mayor to Ontario (Oregon) | 5,343.16 mi (8,598.98 km) |
| Sanlucar la Mayor to Opa-locka (Florida) | 4,319.18 mi (6,951.05 km) |
| Sanlucar la Mayor to Opelika (Alabama) | 4,356.08 mi (7,010.43 km) |
| Sanlucar la Mayor to Opelousas (Louisiana) | 4,770.97 mi (7,678.14 km) |
| Sanlucar la Mayor to Orange (California) | 5,843.78 mi (9,404.65 km) |
| Sanlucar la Mayor to Orange (Texas) | 4,870.49 mi (7,838.30 km) |
| Sanlucar la Mayor to Orange City (Florida) | 4,269.32 mi (6,870.81 km) |
| Sanlucar la Mayor to Orangeburg (South Carolina) | 4,098.52 mi (6,595.92 km) |
