| Merthyr Tudful to Krosno Odrzanskie | 786.11 mi (1,265.12 km) |
| Merthyr Tudful to Krotoszyn | 887.91 mi (1,428.96 km) |
| Merthyr Tudful to Kruszwica | 917.81 mi (1,477.07 km) |
| Merthyr Tudful to Krynica | 1,074.58 mi (1,729.36 km) |
| Merthyr Tudful to Krzeszowice | 1,003.82 mi (1,615.50 km) |
| Merthyr Tudful to Kudowa-Zdroj | 853.48 mi (1,373.54 km) |
| Merthyr Tudful to Kutno | 964.39 mi (1,552.03 km) |
| Merthyr Tudful to Kwidzyn | 939.33 mi (1,511.70 km) |
| Merthyr Tudful to Lancut | 1,116.08 mi (1,796.16 km) |
| Merthyr Tudful to Lapy | 1,105.10 mi (1,778.48 km) |
| Merthyr Tudful to Lask | 960.92 mi (1,546.46 km) |
| Merthyr Tudful to Laziska Gorne | 970.04 mi (1,561.13 km) |
| Merthyr Tudful to Lebork | 893.12 mi (1,437.33 km) |
| Merthyr Tudful to Leczna | 1,123.31 mi (1,807.80 km) |
| Merthyr Tudful to Leczyca | 959.00 mi (1,543.36 km) |
