| Sanlucar de Barrameda to Olympia Heights (Florida) | 4,331.23 mi (6,970.44 km) |
| Sanlucar de Barrameda to Omaha (Nebraska) | 4,598.46 mi (7,400.51 km) |
| Sanlucar de Barrameda to On Top of the World Designated Place (Florida) | 4,320.64 mi (6,953.40 km) |
| Sanlucar de Barrameda to Onalaska (Wisconsin) | 4,296.20 mi (6,914.06 km) |
| Sanlucar de Barrameda to Oneida (New York) | 3,593.57 mi (5,783.30 km) |
| Sanlucar de Barrameda to Oneonta (New York) | 3,578.21 mi (5,758.58 km) |
| Sanlucar de Barrameda to Ontario (California) | 5,844.18 mi (9,405.30 km) |
| Sanlucar de Barrameda to Ontario (Oregon) | 5,368.33 mi (8,639.50 km) |
| Sanlucar de Barrameda to Opa-locka (Florida) | 4,320.67 mi (6,953.44 km) |
| Sanlucar de Barrameda to Opelika (Alabama) | 4,364.39 mi (7,023.81 km) |
| Sanlucar de Barrameda to Opelousas (Louisiana) | 4,780.11 mi (7,692.84 km) |
| Sanlucar de Barrameda to Orange (California) | 5,864.21 mi (9,437.54 km) |
| Sanlucar de Barrameda to Orange (Texas) | 4,879.96 mi (7,853.54 km) |
| Sanlucar de Barrameda to Orange City (Florida) | 4,273.45 mi (6,877.45 km) |
| Sanlucar de Barrameda to Orangeburg (South Carolina) | 4,105.97 mi (6,607.92 km) |
