| San Lorenzo de El Escorial to Olympia Heights (Florida) | 4,389.86 mi (7,064.79 km) |
| San Lorenzo de El Escorial to Omaha (Nebraska) | 4,545.52 mi (7,315.30 km) |
| San Lorenzo de El Escorial to On Top of the World Designated Place (Florida) | 4,358.07 mi (7,013.63 km) |
| San Lorenzo de El Escorial to Onalaska (Wisconsin) | 4,240.41 mi (6,824.28 km) |
| San Lorenzo de El Escorial to Oneida (New York) | 3,569.88 mi (5,745.17 km) |
| San Lorenzo de El Escorial to Oneonta (New York) | 3,559.25 mi (5,728.07 km) |
| San Lorenzo de El Escorial to Ontario (California) | 5,767.35 mi (9,281.65 km) |
| San Lorenzo de El Escorial to Ontario (Oregon) | 5,257.51 mi (8,461.15 km) |
| San Lorenzo de El Escorial to Opa-locka (Florida) | 4,378.69 mi (7,046.82 km) |
| San Lorenzo de El Escorial to Opelika (Alabama) | 4,376.87 mi (7,043.90 km) |
| San Lorenzo de El Escorial to Opelousas (Louisiana) | 4,785.85 mi (7,702.08 km) |
| San Lorenzo de El Escorial to Orange (California) | 5,787.61 mi (9,314.26 km) |
| San Lorenzo de El Escorial to Orange (Texas) | 4,883.15 mi (7,858.68 km) |
| San Lorenzo de El Escorial to Orange City (Florida) | 4,314.25 mi (6,943.12 km) |
| San Lorenzo de El Escorial to Orangeburg (South Carolina) | 4,125.04 mi (6,638.61 km) |
