| Merthyr Tudful to Legionowo | 1,026.54 mi (1,652.05 km) |
| Merthyr Tudful to Legnica | 839.12 mi (1,350.43 km) |
| Merthyr Tudful to Leszno | 850.25 mi (1,368.35 km) |
| Merthyr Tudful to Lezajsk | 1,120.91 mi (1,803.94 km) |
| Merthyr Tudful to Libiaz | 990.90 mi (1,594.70 km) |
| Merthyr Tudful to Lidzbark | 977.00 mi (1,572.33 km) |
| Merthyr Tudful to Lidzbark Warminski | 1,006.32 mi (1,619.51 km) |
| Merthyr Tudful to Limanowa | 1,046.01 mi (1,683.40 km) |
| Merthyr Tudful to Lipno | 951.77 mi (1,531.72 km) |
| Merthyr Tudful to Lobez | 803.67 mi (1,293.38 km) |
| Merthyr Tudful to Lodz | 972.46 mi (1,565.02 km) |
| Merthyr Tudful to Lomianki | 1,027.12 mi (1,652.99 km) |
| Merthyr Tudful to Lomza | 1,070.34 mi (1,722.55 km) |
| Merthyr Tudful to Lowicz | 989.39 mi (1,592.27 km) |
| Merthyr Tudful to Lubaczow | 1,152.19 mi (1,854.27 km) |
