| Merthyr Tudful to Monroe (Washington) | 4,660.98 mi (7,501.12 km) |
| Merthyr Tudful to Monroe (Wisconsin) | 3,859.30 mi (6,210.95 km) |
| Merthyr Tudful to Monroeville (Pennsylvania) | 3,570.11 mi (5,745.53 km) |
| Merthyr Tudful to Monrovia (California) | 5,309.48 mi (8,544.78 km) |
| Merthyr Tudful to Monsey (New York) | 3,308.45 mi (5,324.44 km) |
| Merthyr Tudful to Montclair (California) | 5,305.01 mi (8,537.59 km) |
| Merthyr Tudful to Montclair (Virginia) | 3,552.38 mi (5,717.00 km) |
| Merthyr Tudful to Montebello (California) | 5,321.83 mi (8,564.66 km) |
| Merthyr Tudful to Monterey (California) | 5,296.20 mi (8,523.40 km) |
| Merthyr Tudful to Monterey Park (California) | 5,320.62 mi (8,562.72 km) |
| Merthyr Tudful to Montgomery (Alabama) | 4,214.23 mi (6,782.15 km) |
| Merthyr Tudful to Montgomery (Illinois) | 3,850.99 mi (6,197.57 km) |
| Merthyr Tudful to Montgomery (Ohio) | 3,807.27 mi (6,127.21 km) |
| Merthyr Tudful to Montgomery Village (Maryland) | 3,521.10 mi (5,666.67 km) |
| Merthyr Tudful to Montgomeryville (Pennsylvania) | 3,393.85 mi (5,461.87 km) |
