| Portimao to Mauldin (South Carolina) | 4,018.91 mi (6,467.81 km) |
| Portimao to Maumee (Ohio) | 3,895.43 mi (6,269.10 km) |
| Portimao to Maumelle (Arkansas) | 4,524.47 mi (7,281.42 km) |
| Portimao to Mayagüez (Puerto Rico) | 3,753.83 mi (6,041.21 km) |
| Portimao to Mayfield Heights (Ohio) | 3,790.64 mi (6,100.45 km) |
| Portimao to Mays Chapel (Maryland) | 3,606.20 mi (5,803.61 km) |
| Portimao to Maywood (California) | 5,761.22 mi (9,271.78 km) |
| Portimao to Maywood (Illinois) | 4,085.13 mi (6,574.39 km) |
| Portimao to McAlester (Oklahoma) | 4,687.40 mi (7,543.65 km) |
| Portimao to McAllen (Texas) | 5,134.36 mi (8,262.95 km) |
| Portimao to McCalla (Alabama) | 4,306.47 mi (6,930.59 km) |
| Portimao to McComb (Mississippi) | 4,551.28 mi (7,324.58 km) |
| Portimao to McDonough (Georgia) | 4,154.80 mi (6,686.50 km) |
| Portimao to McFarland (California) | 5,729.52 mi (9,220.77 km) |
| Portimao to McHenry (Illinois) | 4,093.19 mi (6,587.35 km) |
