| Merthyr Tudful to Mill Creek East (Washington) | 4,667.81 mi (7,512.11 km) |
| Merthyr Tudful to Mill Valley (California) | 5,241.04 mi (8,434.63 km) |
| Merthyr Tudful to Millbrae (California) | 5,254.51 mi (8,456.32 km) |
| Merthyr Tudful to Millbrook (Alabama) | 4,211.02 mi (6,776.98 km) |
| Merthyr Tudful to Millcreek (Utah) | 4,746.31 mi (7,638.45 km) |
| Merthyr Tudful to Milledgeville (Georgia) | 4,053.64 mi (6,523.70 km) |
| Merthyr Tudful to Miller Place (New York) | 3,271.68 mi (5,265.25 km) |
| Merthyr Tudful to Millington (Tennessee) | 4,214.73 mi (6,782.96 km) |
| Merthyr Tudful to Millville (New Jersey) | 3,423.78 mi (5,510.05 km) |
| Merthyr Tudful to Milpitas (California) | 5,248.37 mi (8,446.43 km) |
| Merthyr Tudful to Milton (Georgia) | 4,047.16 mi (6,513.27 km) |
| Merthyr Tudful to Milwaukee (Wisconsin) | 3,774.68 mi (6,074.76 km) |
| Merthyr Tudful to Milwaukie (Oregon) | 4,814.21 mi (7,747.73 km) |
| Merthyr Tudful to Minden (Louisiana) | 4,484.12 mi (7,216.49 km) |
| Merthyr Tudful to Mineola (New York) | 3,306.66 mi (5,321.56 km) |
