| Llantrisant to McKeesport (Pennsylvania) | 3,581.97 mi (5,764.62 km) |
| Llantrisant to McKinleyville (California) | 5,122.50 mi (8,243.87 km) |
| Llantrisant to McKinney (Texas) | 4,594.00 mi (7,393.34 km) |
| Llantrisant to McLean (Virginia) | 3,535.58 mi (5,689.96 km) |
| Llantrisant to McMinnville (Oregon) | 4,853.95 mi (7,811.68 km) |
| Llantrisant to McMinnville (Tennessee) | 4,037.05 mi (6,497.01 km) |
| Llantrisant to McNair (Virginia) | 3,544.18 mi (5,703.81 km) |
| Llantrisant to McPherson (Kansas) | 4,372.12 mi (7,036.24 km) |
| Llantrisant to Mead Valley (California) | 5,313.47 mi (8,551.20 km) |
| Llantrisant to Meadow Woods (Florida) | 4,208.74 mi (6,773.31 km) |
| Llantrisant to Meadowbrook (Virginia) | 3,614.95 mi (5,817.71 km) |
| Llantrisant to Meadville (Pennsylvania) | 3,536.93 mi (5,692.15 km) |
| Llantrisant to Mebane (North Carolina) | 3,751.13 mi (6,036.86 km) |
| Llantrisant to Mechanicsville (Virginia) | 3,601.20 mi (5,795.57 km) |
| Llantrisant to Medford (Massachusetts) | 3,136.47 mi (5,047.67 km) |
