| Herndon to Mauldin (South Carolina) | 396.81 mi (638.60 km) |
| Herndon to Maumee (Ohio) | 376.38 mi (605.72 km) |
| Herndon to Maumelle (Arkansas) | 875.58 mi (1,409.11 km) |
| Herndon to Mayagüez (Puerto Rico) | 1,561.27 mi (2,512.62 km) |
| Herndon to Mayfield Heights (Ohio) | 277.40 mi (446.43 km) |
| Herndon to Mays Chapel (Maryland) | 50.78 mi (81.72 km) |
| Herndon to Maywood (California) | 2,273.58 mi (3,658.97 km) |
| Herndon to Maywood (Illinois) | 585.16 mi (941.72 km) |
| Herndon to McAlester (Oklahoma) | 1,050.95 mi (1,691.35 km) |
| Herndon to McAllen (Texas) | 1,493.80 mi (2,404.04 km) |
| Herndon to McCalla (Alabama) | 664.88 mi (1,070.02 km) |
| Herndon to McComb (Mississippi) | 910.55 mi (1,465.39 km) |
| Herndon to McDonough (Georgia) | 536.52 mi (863.45 km) |
| Herndon to McFarland (California) | 2,290.71 mi (3,686.55 km) |
| Herndon to McHenry (Illinois) | 616.68 mi (992.45 km) |
