| Southlake to Mattoon (Illinois) | 665.03 mi (1,070.26 km) |
| Southlake to Mauldin (South Carolina) | 860.26 mi (1,384.46 km) |
| Southlake to Maumee (Ohio) | 948.98 mi (1,527.23 km) |
| Southlake to Maumelle (Arkansas) | 302.28 mi (486.47 km) |
| Southlake to Mayagüez (Puerto Rico) | 2,118.78 mi (3,409.85 km) |
| Southlake to Mayfield Heights (Ohio) | 1,044.08 mi (1,680.28 km) |
| Southlake to Mays Chapel (Maryland) | 1,224.08 mi (1,969.96 km) |
| Southlake to Maywood (California) | 1,212.47 mi (1,951.28 km) |
| Southlake to Maywood (Illinois) | 799.64 mi (1,286.89 km) |
| Southlake to McAlester (Oklahoma) | 157.41 mi (253.32 km) |
| Southlake to McAllen (Texas) | 469.58 mi (755.72 km) |
| Southlake to McCalla (Alabama) | 585.83 mi (942.81 km) |
| Southlake to McComb (Mississippi) | 408.29 mi (657.08 km) |
| Southlake to McDonough (Georgia) | 751.86 mi (1,210.01 km) |
| Southlake to McFarland (California) | 1,271.87 mi (2,046.88 km) |
