| Middle River to Mattoon (Illinois) | 636.83 mi (1,024.88 km) |
| Middle River to Mauldin (South Carolina) | 451.86 mi (727.19 km) |
| Middle River to Maumee (Ohio) | 410.27 mi (660.27 km) |
| Middle River to Maumelle (Arkansas) | 931.89 mi (1,499.73 km) |
| Middle River to Mayagüez (Puerto Rico) | 1,563.11 mi (2,515.59 km) |
| Middle River to Mayfield Heights (Ohio) | 304.05 mi (489.31 km) |
| Middle River to Mays Chapel (Maryland) | 13.61 mi (21.91 km) |
| Middle River to Maywood (California) | 2,323.06 mi (3,738.61 km) |
| Middle River to Maywood (Illinois) | 623.49 mi (1,003.41 km) |
| Middle River to McAlester (Oklahoma) | 1,106.12 mi (1,780.12 km) |
| Middle River to McAllen (Texas) | 1,551.35 mi (2,496.65 km) |
| Middle River to McCalla (Alabama) | 722.19 mi (1,162.25 km) |
| Middle River to McComb (Mississippi) | 967.97 mi (1,557.79 km) |
| Middle River to McDonough (Georgia) | 592.02 mi (952.76 km) |
| Middle River to McFarland (California) | 2,338.35 mi (3,763.21 km) |
