| Bargoed to McKeesport (Pennsylvania) | 3,584.01 mi (5,767.91 km) |
| Bargoed to McKinleyville (California) | 5,118.86 mi (8,238.02 km) |
| Bargoed to McKinney (Texas) | 4,595.06 mi (7,395.03 km) |
| Bargoed to McLean (Virginia) | 3,538.23 mi (5,694.23 km) |
| Bargoed to McMinnville (Oregon) | 4,849.93 mi (7,805.21 km) |
| Bargoed to McMinnville (Tennessee) | 4,039.18 mi (6,500.43 km) |
| Bargoed to McNair (Virginia) | 3,546.81 mi (5,708.03 km) |
| Bargoed to McPherson (Kansas) | 4,372.24 mi (7,036.44 km) |
| Bargoed to Mead Valley (California) | 5,311.57 mi (8,548.15 km) |
| Bargoed to Meadow Woods (Florida) | 4,212.66 mi (6,779.63 km) |
| Bargoed to Meadowbrook (Virginia) | 3,617.86 mi (5,822.39 km) |
| Bargoed to Meadville (Pennsylvania) | 3,538.68 mi (5,694.95 km) |
| Bargoed to Mebane (North Carolina) | 3,754.05 mi (6,041.56 km) |
| Bargoed to Mechanicsville (Virginia) | 3,604.09 mi (5,800.22 km) |
| Bargoed to Medford (Massachusetts) | 3,139.16 mi (5,051.98 km) |
