| Herndon to McKeesport (Pennsylvania) | 161.45 mi (259.84 km) |
| Herndon to McKinleyville (California) | 2,447.35 mi (3,938.63 km) |
| Herndon to McKinney (Texas) | 1,145.18 mi (1,842.99 km) |
| Herndon to McLean (Virginia) | 10.50 mi (16.89 km) |
| Herndon to McMinnville (Oregon) | 2,355.33 mi (3,790.54 km) |
| Herndon to McMinnville (Tennessee) | 513.69 mi (826.71 km) |
| Herndon to McNair (Virginia) | 1.85 mi (2.98 km) |
| Herndon to McPherson (Kansas) | 1,092.19 mi (1,757.71 km) |
| Herndon to Mead Valley (California) | 2,229.02 mi (3,587.26 km) |
| Herndon to Meadow Woods (Florida) | 766.75 mi (1,233.96 km) |
| Herndon to Meadowbrook (Virginia) | 106.50 mi (171.39 km) |
| Herndon to Meadville (Pennsylvania) | 235.30 mi (378.67 km) |
| Herndon to Mebane (North Carolina) | 224.52 mi (361.33 km) |
| Herndon to Mechanicsville (Virginia) | 92.85 mi (149.43 km) |
| Herndon to Medford (Massachusetts) | 406.13 mi (653.60 km) |
