| Hoyo de Manzanares to Olympia Heights (Florida) | 4,402.57 mi (7,085.26 km) |
| Hoyo de Manzanares to Omaha (Nebraska) | 4,555.16 mi (7,330.83 km) |
| Hoyo de Manzanares to On Top of the World Designated Place (Florida) | 4,370.34 mi (7,033.38 km) |
| Hoyo de Manzanares to Onalaska (Wisconsin) | 4,249.99 mi (6,839.70 km) |
| Hoyo de Manzanares to Oneida (New York) | 3,580.61 mi (5,762.43 km) |
| Hoyo de Manzanares to Oneonta (New York) | 3,570.13 mi (5,745.57 km) |
| Hoyo de Manzanares to Ontario (California) | 5,775.98 mi (9,295.54 km) |
| Hoyo de Manzanares to Ontario (Oregon) | 5,264.79 mi (8,472.85 km) |
| Hoyo de Manzanares to Opa-locka (Florida) | 4,391.40 mi (7,067.27 km) |
| Hoyo de Manzanares to Opelika (Alabama) | 4,388.54 mi (7,062.66 km) |
| Hoyo de Manzanares to Opelousas (Louisiana) | 4,797.30 mi (7,720.50 km) |
| Hoyo de Manzanares to Orange (California) | 5,796.25 mi (9,328.16 km) |
| Hoyo de Manzanares to Orange (Texas) | 4,894.52 mi (7,876.97 km) |
| Hoyo de Manzanares to Orange City (Florida) | 4,326.60 mi (6,962.99 km) |
| Hoyo de Manzanares to Orangeburg (South Carolina) | 4,136.89 mi (6,657.68 km) |
