| Greenock to Mauldin (South Carolina) | 3,808.29 mi (6,128.85 km) |
| Greenock to Maumee (Ohio) | 3,518.13 mi (5,661.88 km) |
| Greenock to Maumelle (Arkansas) | 4,180.05 mi (6,727.14 km) |
| Greenock to Mayagüez (Puerto Rico) | 4,120.75 mi (6,631.71 km) |
| Greenock to Mayfield Heights (Ohio) | 3,439.43 mi (5,535.23 km) |
| Greenock to Mays Chapel (Maryland) | 3,360.96 mi (5,408.95 km) |
| Greenock to Maywood (California) | 5,100.55 mi (8,208.54 km) |
| Greenock to Maywood (Illinois) | 3,654.34 mi (5,881.09 km) |
| Greenock to McAlester (Oklahoma) | 4,298.10 mi (6,917.12 km) |
| Greenock to McAllen (Texas) | 4,863.41 mi (7,826.90 km) |
| Greenock to McCalla (Alabama) | 4,063.26 mi (6,539.18 km) |
| Greenock to McComb (Mississippi) | 4,301.14 mi (6,922.02 km) |
| Greenock to McDonough (Georgia) | 3,947.73 mi (6,353.26 km) |
| Greenock to McFarland (California) | 5,033.78 mi (8,101.08 km) |
| Greenock to McHenry (Illinois) | 3,647.69 mi (5,870.38 km) |
