| Porto de Mos to Olympia Heights (Florida) | 4,160.75 mi (6,696.07 km) |
| Porto de Mos to Omaha (Nebraska) | 4,377.95 mi (7,045.62 km) |
| Porto de Mos to On Top of the World Designated Place (Florida) | 4,138.21 mi (6,659.80 km) |
| Porto de Mos to Onalaska (Wisconsin) | 4,074.60 mi (6,557.44 km) |
| Porto de Mos to Oneida (New York) | 3,382.37 mi (5,443.40 km) |
| Porto de Mos to Oneonta (New York) | 3,368.83 mi (5,421.61 km) |
| Porto de Mos to Ontario (California) | 5,617.62 mi (9,040.69 km) |
| Porto de Mos to Ontario (Oregon) | 5,134.62 mi (8,263.37 km) |
| Porto de Mos to Opa-locka (Florida) | 4,149.82 mi (6,678.49 km) |
| Porto de Mos to Opelika (Alabama) | 4,169.40 mi (6,710.00 km) |
| Porto de Mos to Opelousas (Louisiana) | 4,582.31 mi (7,374.51 km) |
| Porto de Mos to Orange (California) | 5,637.72 mi (9,073.03 km) |
| Porto de Mos to Orange (Texas) | 4,681.08 mi (7,533.47 km) |
| Porto de Mos to Orange City (Florida) | 4,092.80 mi (6,586.72 km) |
| Porto de Mos to Orangeburg (South Carolina) | 3,913.93 mi (6,298.86 km) |
