| Llantrisant to Mauldin (South Carolina) | 3,937.55 mi (6,336.88 km) |
| Llantrisant to Maumee (Ohio) | 3,680.44 mi (5,923.10 km) |
| Llantrisant to Maumelle (Arkansas) | 4,343.16 mi (6,989.65 km) |
| Llantrisant to Mayagüez (Puerto Rico) | 4,119.21 mi (6,629.23 km) |
| Llantrisant to Mayfield Heights (Ohio) | 3,594.92 mi (5,785.47 km) |
| Llantrisant to Mays Chapel (Maryland) | 3,491.56 mi (5,619.12 km) |
| Llantrisant to Maywood (California) | 5,334.82 mi (8,585.56 km) |
| Llantrisant to Maywood (Illinois) | 3,830.00 mi (6,163.78 km) |
| Llantrisant to McAlester (Oklahoma) | 4,472.01 mi (7,197.00 km) |
| Llantrisant to McAllen (Texas) | 5,017.77 mi (8,075.33 km) |
| Llantrisant to McCalla (Alabama) | 4,203.00 mi (6,764.07 km) |
| Llantrisant to McComb (Mississippi) | 4,445.16 mi (7,153.80 km) |
| Llantrisant to McDonough (Georgia) | 4,078.02 mi (6,562.94 km) |
| Llantrisant to McFarland (California) | 5,274.01 mi (8,487.71 km) |
| Llantrisant to McHenry (Illinois) | 3,826.42 mi (6,158.03 km) |
