| Middlesex to Mattoon (Illinois) | 736.51 mi (1,185.30 km) |
| Middlesex to Mauldin (South Carolina) | 584.52 mi (940.69 km) |
| Middlesex to Maumee (Ohio) | 481.95 mi (775.62 km) |
| Middlesex to Maumelle (Arkansas) | 1,052.75 mi (1,694.24 km) |
| Middlesex to Mayagüez (Puerto Rico) | 1,606.62 mi (2,585.61 km) |
| Middlesex to Mayfield Heights (Ohio) | 367.98 mi (592.21 km) |
| Middlesex to Mays Chapel (Maryland) | 138.41 mi (222.75 km) |
| Middlesex to Maywood (California) | 2,419.10 mi (3,893.17 km) |
| Middlesex to Maywood (Illinois) | 698.49 mi (1,124.12 km) |
| Middlesex to McAlester (Oklahoma) | 1,222.28 mi (1,967.06 km) |
| Middlesex to McAllen (Texas) | 1,681.69 mi (2,706.42 km) |
| Middlesex to McCalla (Alabama) | 853.69 mi (1,373.88 km) |
| Middlesex to McComb (Mississippi) | 1,099.10 mi (1,768.82 km) |
| Middlesex to McDonough (Georgia) | 724.73 mi (1,166.34 km) |
| Middlesex to McFarland (California) | 2,428.89 mi (3,908.91 km) |
