| Merthyr Tudful to Marietta (Georgia) | 4,065.29 mi (6,542.46 km) |
| Merthyr Tudful to Marietta (Ohio) | 3,683.01 mi (5,927.23 km) |
| Merthyr Tudful to Marina (California) | 5,288.25 mi (8,510.62 km) |
| Merthyr Tudful to Marinette (Wisconsin) | 3,671.68 mi (5,909.00 km) |
| Merthyr Tudful to Marion (Arkansas) | 4,233.38 mi (6,812.97 km) |
| Merthyr Tudful to Marion (Illinois) | 4,060.75 mi (6,535.14 km) |
| Merthyr Tudful to Marion (Indiana) | 3,799.66 mi (6,114.97 km) |
| Merthyr Tudful to Marion (Iowa) | 3,958.88 mi (6,371.20 km) |
| Merthyr Tudful to Marion (Ohio) | 3,697.15 mi (5,949.98 km) |
| Merthyr Tudful to Marion Oaks (Florida) | 4,210.51 mi (6,776.16 km) |
| Merthyr Tudful to Markham (Illinois) | 3,830.72 mi (6,164.94 km) |
| Merthyr Tudful to Marlborough (Massachusetts) | 3,153.49 mi (5,075.05 km) |
| Merthyr Tudful to Marlton (New Jersey) | 3,396.22 mi (5,465.69 km) |
| Merthyr Tudful to Marquette (Michigan) | 3,599.68 mi (5,793.12 km) |
| Merthyr Tudful to Marrero (Louisiana) | 4,494.38 mi (7,233.01 km) |
