| Merthyr Tudful to Miami Lakes (Florida) | 4,286.04 mi (6,897.71 km) |
| Merthyr Tudful to Miami Shores (Florida) | 4,282.24 mi (6,891.61 km) |
| Merthyr Tudful to Miami Springs (Florida) | 4,289.38 mi (6,903.08 km) |
| Merthyr Tudful to Miamisburg (Ohio) | 3,786.77 mi (6,094.21 km) |
| Merthyr Tudful to Michigan City (Indiana) | 3,793.92 mi (6,105.73 km) |
| Merthyr Tudful to Middle Island (New York) | 3,272.18 mi (5,266.07 km) |
| Merthyr Tudful to Middle River (Maryland) | 3,482.20 mi (5,604.05 km) |
| Merthyr Tudful to Middle Valley (Tennessee) | 4,032.56 mi (6,489.78 km) |
| Merthyr Tudful to Middleburg (Florida) | 4,146.25 mi (6,672.74 km) |
| Merthyr Tudful to Middleburg Heights (Ohio) | 3,610.62 mi (5,810.72 km) |
| Merthyr Tudful to Middlesex (New Jersey) | 3,349.48 mi (5,390.47 km) |
| Merthyr Tudful to Middleton (Wisconsin) | 3,831.22 mi (6,165.75 km) |
| Merthyr Tudful to Middletown (Connecticut) | 3,232.29 mi (5,201.87 km) |
| Merthyr Tudful to Middletown (Delaware) | 3,448.66 mi (5,550.08 km) |
| Merthyr Tudful to Middletown (New York) | 3,309.08 mi (5,325.45 km) |
