| Sintra to Mauldin (South Carolina) | 3,934.25 mi (6,331.57 km) |
| Sintra to Maumee (Ohio) | 3,799.13 mi (6,114.11 km) |
| Sintra to Maumelle (Arkansas) | 4,432.91 mi (7,134.08 km) |
| Sintra to Mayagüez (Puerto Rico) | 3,716.46 mi (5,981.07 km) |
| Sintra to Mayfield Heights (Ohio) | 3,695.48 mi (5,947.30 km) |
| Sintra to Mays Chapel (Maryland) | 3,516.97 mi (5,660.02 km) |
| Sintra to Maywood (California) | 5,654.18 mi (9,099.52 km) |
| Sintra to Maywood (Illinois) | 3,986.38 mi (6,415.46 km) |
| Sintra to McAlester (Oklahoma) | 4,593.53 mi (7,392.57 km) |
| Sintra to McAllen (Texas) | 5,050.23 mi (8,127.56 km) |
| Sintra to McCalla (Alabama) | 4,220.88 mi (6,792.86 km) |
| Sintra to McComb (Mississippi) | 4,466.29 mi (7,187.79 km) |
| Sintra to McDonough (Georgia) | 4,071.07 mi (6,551.75 km) |
| Sintra to McFarland (California) | 5,620.52 mi (9,045.35 km) |
| Sintra to McHenry (Illinois) | 3,993.59 mi (6,427.07 km) |
