| Merthyr Tudful to Montevarchi | 895.06 mi (1,440.47 km) |
| Merthyr Tudful to Monticello Conte Otto | 801.55 mi (1,289.97 km) |
| Merthyr Tudful to Montichiari | 764.36 mi (1,230.11 km) |
| Merthyr Tudful to Montignoso | 821.67 mi (1,322.35 km) |
| Merthyr Tudful to Montopoli in Val d'Arno | 859.30 mi (1,382.91 km) |
| Merthyr Tudful to Monza | 715.63 mi (1,151.69 km) |
| Merthyr Tudful to Morbegno | 702.27 mi (1,130.20 km) |
| Merthyr Tudful to Mori | 768.06 mi (1,236.07 km) |
| Merthyr Tudful to Morlupo | 996.73 mi (1,604.09 km) |
| Merthyr Tudful to Morrovalle | 978.48 mi (1,574.71 km) |
| Merthyr Tudful to Mortara | 712.30 mi (1,146.33 km) |
| Merthyr Tudful to Mosciano Sant'Angelo | 1,016.27 mi (1,635.54 km) |
| Merthyr Tudful to Motta di Livenza | 834.05 mi (1,342.27 km) |
| Merthyr Tudful to Motta Sant'Anastasia | 1,327.55 mi (2,136.49 km) |
| Merthyr Tudful to Mottola | 1,234.68 mi (1,987.02 km) |
