| Llanelli to Mauldin (South Carolina) | 3,902.35 mi (6,280.23 km) |
| Llanelli to Maumee (Ohio) | 3,645.47 mi (5,866.82 km) |
| Llanelli to Maumelle (Arkansas) | 4,308.17 mi (6,933.33 km) |
| Llanelli to Mayagüez (Puerto Rico) | 4,087.44 mi (6,578.11 km) |
| Llanelli to Mayfield Heights (Ohio) | 3,559.86 mi (5,729.05 km) |
| Llanelli to Mays Chapel (Maryland) | 3,456.35 mi (5,562.47 km) |
| Llanelli to Maywood (California) | 5,302.42 mi (8,533.42 km) |
| Llanelli to Maywood (Illinois) | 3,795.26 mi (6,107.88 km) |
| Llanelli to McAlester (Oklahoma) | 4,437.20 mi (7,140.98 km) |
| Llanelli to McAllen (Texas) | 4,982.66 mi (8,018.81 km) |
| Llanelli to McCalla (Alabama) | 4,167.80 mi (6,707.43 km) |
| Llanelli to McComb (Mississippi) | 4,409.98 mi (7,097.18 km) |
| Llanelli to McDonough (Georgia) | 4,042.82 mi (6,506.28 km) |
| Llanelli to McFarland (California) | 5,242.04 mi (8,436.26 km) |
| Llanelli to McHenry (Illinois) | 3,791.76 mi (6,102.24 km) |
