| Povoa de Varzim to Olympia Heights (Florida) | 4,143.14 mi (6,667.73 km) |
| Povoa de Varzim to Omaha (Nebraska) | 4,314.45 mi (6,943.44 km) |
| Povoa de Varzim to On Top of the World Designated Place (Florida) | 4,111.39 mi (6,616.64 km) |
| Povoa de Varzim to Onalaska (Wisconsin) | 4,010.03 mi (6,453.52 km) |
| Povoa de Varzim to Oneida (New York) | 3,330.46 mi (5,359.85 km) |
| Povoa de Varzim to Oneonta (New York) | 3,318.84 mi (5,341.16 km) |
| Povoa de Varzim to Ontario (California) | 5,545.40 mi (8,924.45 km) |
| Povoa de Varzim to Ontario (Oregon) | 5,050.43 mi (8,127.87 km) |
| Povoa de Varzim to Opa-locka (Florida) | 4,131.95 mi (6,649.74 km) |
| Povoa de Varzim to Opelika (Alabama) | 4,132.01 mi (6,649.82 km) |
| Povoa de Varzim to Opelousas (Louisiana) | 4,541.94 mi (7,309.55 km) |
| Povoa de Varzim to Orange (California) | 5,565.58 mi (8,956.94 km) |
| Povoa de Varzim to Orange (Texas) | 4,639.63 mi (7,466.77 km) |
| Povoa de Varzim to Orange City (Florida) | 4,067.47 mi (6,545.96 km) |
| Povoa de Varzim to Orangeburg (South Carolina) | 3,879.44 mi (6,243.35 km) |
