| Povoa de Lanhoso to Olympia Heights (Florida) | 4,166.32 mi (6,705.04 km) |
| Povoa de Lanhoso to Omaha (Nebraska) | 4,329.23 mi (6,967.22 km) |
| Povoa de Lanhoso to On Top of the World Designated Place (Florida) | 4,133.22 mi (6,651.77 km) |
| Povoa de Lanhoso to Onalaska (Wisconsin) | 4,024.59 mi (6,476.95 km) |
| Povoa de Lanhoso to Oneida (New York) | 3,347.91 mi (5,387.95 km) |
| Povoa de Lanhoso to Oneonta (New York) | 3,336.69 mi (5,369.89 km) |
| Povoa de Lanhoso to Ontario (California) | 5,557.88 mi (8,944.54 km) |
| Povoa de Lanhoso to Ontario (Oregon) | 5,059.60 mi (8,142.64 km) |
| Povoa de Lanhoso to Opa-locka (Florida) | 4,155.10 mi (6,686.98 km) |
| Povoa de Lanhoso to Opelika (Alabama) | 4,152.10 mi (6,682.15 km) |
| Povoa de Lanhoso to Opelousas (Louisiana) | 4,561.46 mi (7,340.96 km) |
| Povoa de Lanhoso to Orange (California) | 5,578.08 mi (8,977.06 km) |
| Povoa de Lanhoso to Orange (Texas) | 4,658.94 mi (7,497.84 km) |
| Povoa de Lanhoso to Orange City (Florida) | 4,089.53 mi (6,581.47 km) |
| Povoa de Lanhoso to Orangeburg (South Carolina) | 3,900.06 mi (6,276.54 km) |
