| Rockwall to Mattoon (Illinois) | 638.35 mi (1,027.33 km) |
| Rockwall to Mauldin (South Carolina) | 820.51 mi (1,320.48 km) |
| Rockwall to Maumee (Ohio) | 920.73 mi (1,481.77 km) |
| Rockwall to Maumelle (Arkansas) | 267.38 mi (430.30 km) |
| Rockwall to Mayagüez (Puerto Rico) | 2,079.40 mi (3,346.48 km) |
| Rockwall to Mayfield Heights (Ohio) | 1,013.87 mi (1,631.66 km) |
| Rockwall to Mays Chapel (Maryland) | 1,188.63 mi (1,912.92 km) |
| Rockwall to Maywood (California) | 1,253.68 mi (2,017.61 km) |
| Rockwall to Maywood (Illinois) | 777.55 mi (1,251.34 km) |
| Rockwall to McAlester (Oklahoma) | 143.92 mi (231.62 km) |
| Rockwall to McAllen (Texas) | 474.94 mi (764.34 km) |
| Rockwall to McCalla (Alabama) | 544.90 mi (876.94 km) |
| Rockwall to McComb (Mississippi) | 367.81 mi (591.94 km) |
| Rockwall to McDonough (Georgia) | 711.04 mi (1,144.32 km) |
| Rockwall to McFarland (California) | 1,312.52 mi (2,112.29 km) |
