| Merthyr Tudful to Le Locle | 558.06 mi (898.10 km) |
| Merthyr Tudful to Le Mont-sur-Lausanne | 577.69 mi (929.70 km) |
| Merthyr Tudful to Lenzburg | 598.32 mi (962.90 km) |
| Merthyr Tudful to Liestal | 577.74 mi (929.79 km) |
| Merthyr Tudful to Littau | 614.74 mi (989.33 km) |
| Merthyr Tudful to Locarno | 672.22 mi (1,081.83 km) |
| Merthyr Tudful to Lucerne | 616.09 mi (991.50 km) |
| Merthyr Tudful to Lugano | 684.97 mi (1,102.35 km) |
| Merthyr Tudful to Lutry | 580.68 mi (934.51 km) |
| Merthyr Tudful to Lyss | 577.78 mi (929.85 km) |
| Merthyr Tudful to Mannedorf | 622.97 mi (1,002.57 km) |
| Merthyr Tudful to Martigny | 612.88 mi (986.34 km) |
| Merthyr Tudful to Mattenhof | 616.25 mi (991.76 km) |
| Merthyr Tudful to Maur | 618.79 mi (995.85 km) |
| Merthyr Tudful to Meilen | 620.26 mi (998.21 km) |
