| Merthyr Tudful to Melzo | 724.64 mi (1,166.20 km) |
| Merthyr Tudful to Mendicino | 1,273.90 mi (2,050.15 km) |
| Merthyr Tudful to Menfi | 1,258.49 mi (2,025.35 km) |
| Merthyr Tudful to Mentana | 1,008.23 mi (1,622.58 km) |
| Merthyr Tudful to Merano | 742.15 mi (1,194.37 km) |
| Merthyr Tudful to Merate | 716.24 mi (1,152.68 km) |
| Merthyr Tudful to Mercato San Severino | 1,145.22 mi (1,843.06 km) |
| Merthyr Tudful to Mercogliano | 1,137.27 mi (1,830.27 km) |
| Merthyr Tudful to Mesagne | 1,266.39 mi (2,038.06 km) |
| Merthyr Tudful to Messina | 1,308.83 mi (2,106.35 km) |
| Merthyr Tudful to Mestre | 831.37 mi (1,337.97 km) |
| Merthyr Tudful to Mestrino | 814.90 mi (1,311.46 km) |
| Merthyr Tudful to Milan | 717.92 mi (1,155.37 km) |
| Merthyr Tudful to Milazzo | 1,296.93 mi (2,087.21 km) |
| Merthyr Tudful to Minerbio | 840.30 mi (1,352.33 km) |
