| Merthyr Tudful to Manerbio | 756.97 mi (1,218.23 km) |
| Merthyr Tudful to Manfredonia | 1,144.78 mi (1,842.34 km) |
| Merthyr Tudful to Maniago | 823.16 mi (1,324.74 km) |
| Merthyr Tudful to Mantova | 790.76 mi (1,272.61 km) |
| Merthyr Tudful to Maranello | 821.95 mi (1,322.80 km) |
| Merthyr Tudful to Marano di Napoli | 1,118.74 mi (1,800.43 km) |
| Merthyr Tudful to Marano Vicentino | 791.60 mi (1,273.96 km) |
| Merthyr Tudful to Marcianise | 1,116.02 mi (1,796.06 km) |
| Merthyr Tudful to Marcon | 831.12 mi (1,337.56 km) |
| Merthyr Tudful to Mareno di Piave | 821.53 mi (1,322.12 km) |
| Merthyr Tudful to Margherita di Savoia | 1,166.28 mi (1,876.95 km) |
| Merthyr Tudful to Mariano Comense | 707.07 mi (1,137.91 km) |
| Merthyr Tudful to Marigliano | 1,126.40 mi (1,812.77 km) |
| Merthyr Tudful to Marino | 1,021.56 mi (1,644.04 km) |
| Merthyr Tudful to Marostica | 798.27 mi (1,284.69 km) |
