| Merthyr Tudful to Middletown (Ohio) | 3,796.40 mi (6,109.72 km) |
| Merthyr Tudful to Midland (Michigan) | 3,606.19 mi (5,803.60 km) |
| Merthyr Tudful to Midland (Texas) | 4,859.10 mi (7,819.96 km) |
| Merthyr Tudful to Midlothian (Illinois) | 3,830.86 mi (6,165.18 km) |
| Merthyr Tudful to Midlothian (Texas) | 4,638.31 mi (7,464.63 km) |
| Merthyr Tudful to Midlothian (Virginia) | 3,616.04 mi (5,819.45 km) |
| Merthyr Tudful to Midvale (Utah) | 4,752.40 mi (7,648.25 km) |
| Merthyr Tudful to Midway (Florida) | 4,340.99 mi (6,986.15 km) |
| Merthyr Tudful to Midwest City (Oklahoma) | 4,500.48 mi (7,242.83 km) |
| Merthyr Tudful to Milford (Delaware) | 3,460.12 mi (5,568.52 km) |
| Merthyr Tudful to Milford city (Connecticut) | 3,262.61 mi (5,250.66 km) |
| Merthyr Tudful to Milford Mill (Maryland) | 3,496.18 mi (5,626.56 km) |
| Merthyr Tudful to Mililani Mauka (Hawaii) | 7,149.73 mi (11,506.38 km) |
| Merthyr Tudful to Mililani Town (Hawaii) | 7,152.01 mi (11,510.05 km) |
| Merthyr Tudful to Mill Creek (Washington) | 4,666.73 mi (7,510.38 km) |
