| Pontneddfechan to McKeesport (Pennsylvania) | 3,568.47 mi (5,742.89 km) |
| Pontneddfechan to McKinleyville (California) | 5,105.47 mi (8,216.46 km) |
| Pontneddfechan to McKinney (Texas) | 4,579.63 mi (7,370.21 km) |
| Pontneddfechan to McLean (Virginia) | 3,522.67 mi (5,669.20 km) |
| Pontneddfechan to McMinnville (Oregon) | 4,836.82 mi (7,784.11 km) |
| Pontneddfechan to McMinnville (Tennessee) | 4,023.63 mi (6,475.41 km) |
| Pontneddfechan to McNair (Virginia) | 3,531.25 mi (5,683.00 km) |
| Pontneddfechan to McPherson (Kansas) | 4,357.02 mi (7,011.94 km) |
| Pontneddfechan to Mead Valley (California) | 5,297.13 mi (8,524.91 km) |
| Pontneddfechan to Meadow Woods (Florida) | 4,197.22 mi (6,754.78 km) |
| Pontneddfechan to Meadowbrook (Virginia) | 3,602.31 mi (5,797.36 km) |
| Pontneddfechan to Meadville (Pennsylvania) | 3,523.16 mi (5,669.97 km) |
| Pontneddfechan to Mebane (North Carolina) | 3,738.50 mi (6,016.54 km) |
| Pontneddfechan to Mechanicsville (Virginia) | 3,588.54 mi (5,775.19 km) |
| Pontneddfechan to Medford (Massachusetts) | 3,123.60 mi (5,026.95 km) |
