| Portimao to Odessa (Texas) | 5,120.01 mi (8,239.86 km) |
| Portimao to Ogden (Utah) | 5,182.76 mi (8,340.84 km) |
| Portimao to Oildale (California) | 5,731.95 mi (9,224.68 km) |
| Portimao to Ojus (Florida) | 4,190.13 mi (6,743.36 km) |
| Portimao to Okemos (Michigan) | 3,901.46 mi (6,278.80 km) |
| Portimao to Oklahoma City (Oklahoma) | 4,752.38 mi (7,648.22 km) |
| Portimao to Okmulgee (Oklahoma) | 4,674.52 mi (7,522.91 km) |
| Portimao to Olathe (Kansas) | 4,505.89 mi (7,251.53 km) |
| Portimao to Old Jamestown (Missouri) | 4,291.47 mi (6,906.45 km) |
| Portimao to Oldsmar (Florida) | 4,253.23 mi (6,844.91 km) |
| Portimao to Olean (New York) | 3,631.19 mi (5,843.83 km) |
| Portimao to Olive Branch (Mississippi) | 4,394.18 mi (7,071.74 km) |
| Portimao to Olivehurst (California) | 5,667.93 mi (9,121.65 km) |
| Portimao to Olney (Maryland) | 3,634.24 mi (5,848.74 km) |
| Portimao to Olympia (Washington) | 5,349.31 mi (8,608.88 km) |
