| Merthyr Tudful to Mechernich | 441.17 mi (710.00 km) |
| Merthyr Tudful to Meckenbeuren | 640.80 mi (1,031.26 km) |
| Merthyr Tudful to Meckenheim | 456.22 mi (734.21 km) |
| Merthyr Tudful to Meerane | 685.80 mi (1,103.68 km) |
| Merthyr Tudful to Meerbusch | 432.90 mi (696.68 km) |
| Merthyr Tudful to Meine | 591.66 mi (952.18 km) |
| Merthyr Tudful to Meinerzhagen | 475.85 mi (765.81 km) |
| Merthyr Tudful to Meiningen | 602.65 mi (969.87 km) |
| Merthyr Tudful to Meissen | 725.42 mi (1,167.45 km) |
| Merthyr Tudful to Meitingen | 665.96 mi (1,071.76 km) |
| Merthyr Tudful to Melle | 499.18 mi (803.35 km) |
| Merthyr Tudful to Melsungen | 557.66 mi (897.47 km) |
| Merthyr Tudful to Memmelsdorf | 636.61 mi (1,024.52 km) |
| Merthyr Tudful to Memmingen | 655.98 mi (1,055.70 km) |
| Merthyr Tudful to Mendig | 471.98 mi (759.58 km) |
