| Merthyr Tudful to Mansfield | 133.47 mi (214.80 km) |
| Merthyr Tudful to March | 157.18 mi (252.96 km) |
| Merthyr Tudful to Margate | 205.98 mi (331.49 km) |
| Merthyr Tudful to Market Drayton | 88.67 mi (142.69 km) |
| Merthyr Tudful to Market Harborough | 115.96 mi (186.62 km) |
| Merthyr Tudful to Marlow | 111.99 mi (180.24 km) |
| Merthyr Tudful to Marple | 126.95 mi (204.31 km) |
| Merthyr Tudful to Marton | 213.01 mi (342.81 km) |
| Merthyr Tudful to Maryport | 205.25 mi (330.31 km) |
| Merthyr Tudful to Matlock | 123.46 mi (198.69 km) |
| Merthyr Tudful to Melksham | 59.14 mi (95.18 km) |
| Merthyr Tudful to Meltham | 142.89 mi (229.96 km) |
| Merthyr Tudful to Melton Mowbray | 126.90 mi (204.23 km) |
| Merthyr Tudful to Methil | 307.21 mi (494.41 km) |
| Merthyr Tudful to Mexborough | 149.81 mi (241.09 km) |
