| Merthyr Tudful to Miedzychod | 815.90 mi (1,313.06 km) |
| Merthyr Tudful to Miedzyrzec Podlaski | 1,110.33 mi (1,786.91 km) |
| Merthyr Tudful to Miedzyrzecz | 804.22 mi (1,294.26 km) |
| Merthyr Tudful to Mielec | 1,077.98 mi (1,734.84 km) |
| Merthyr Tudful to Mikolow | 971.88 mi (1,564.09 km) |
| Merthyr Tudful to Milanowek | 1,020.59 mi (1,642.47 km) |
| Merthyr Tudful to Milicz | 883.13 mi (1,421.26 km) |
| Merthyr Tudful to Minsk Mazowiecki | 1,057.16 mi (1,701.34 km) |
| Merthyr Tudful to Mlawa | 1,000.18 mi (1,609.63 km) |
| Merthyr Tudful to Mogilno | 902.12 mi (1,451.82 km) |
| Merthyr Tudful to Monki | 1,099.65 mi (1,769.72 km) |
| Merthyr Tudful to Morag | 980.06 mi (1,577.26 km) |
| Merthyr Tudful to Mosina | 858.25 mi (1,381.22 km) |
| Merthyr Tudful to Mragowo | 1,035.77 mi (1,666.92 km) |
| Merthyr Tudful to Murowana Goslina | 863.52 mi (1,389.71 km) |
