| Merthyr Tudful to Kluczbork | 929.67 mi (1,496.16 km) |
| Merthyr Tudful to Knurow | 961.73 mi (1,547.75 km) |
| Merthyr Tudful to Kobylka | 1,040.38 mi (1,674.32 km) |
| Merthyr Tudful to Kokoszki | 922.13 mi (1,484.03 km) |
| Merthyr Tudful to Kolbuszowa | 1,092.80 mi (1,758.68 km) |
| Merthyr Tudful to Kolno | 1,063.34 mi (1,711.28 km) |
| Merthyr Tudful to Kolo | 933.84 mi (1,502.88 km) |
| Merthyr Tudful to Kolobrzeg | 803.98 mi (1,293.88 km) |
| Merthyr Tudful to Koluszki | 987.33 mi (1,588.96 km) |
| Merthyr Tudful to Komorniki | 852.01 mi (1,371.18 km) |
| Merthyr Tudful to Konin | 918.29 mi (1,477.85 km) |
| Merthyr Tudful to Konskie | 1,020.23 mi (1,641.90 km) |
| Merthyr Tudful to Konstancin-Jeziorna | 1,039.28 mi (1,672.56 km) |
| Merthyr Tudful to Konstantynow Lodzki | 967.62 mi (1,557.23 km) |
| Merthyr Tudful to Koronowo | 898.94 mi (1,446.70 km) |
