| Merthyr Tudful to Koscian | 851.22 mi (1,369.91 km) |
| Merthyr Tudful to Koscielisko | 1,031.49 mi (1,660.02 km) |
| Merthyr Tudful to Koscierzyna | 901.04 mi (1,450.08 km) |
| Merthyr Tudful to Kostrzyn | 873.14 mi (1,405.18 km) |
| Merthyr Tudful to Kostrzyn nad Odra | 764.96 mi (1,231.08 km) |
| Merthyr Tudful to Koszalin | 828.58 mi (1,333.47 km) |
| Merthyr Tudful to Kowary | 830.69 mi (1,336.87 km) |
| Merthyr Tudful to Kozienice | 1,063.90 mi (1,712.18 km) |
| Merthyr Tudful to Kozuchow | 809.56 mi (1,302.85 km) |
| Merthyr Tudful to Kozy | 988.15 mi (1,590.27 km) |
| Merthyr Tudful to Krakow | 1,018.13 mi (1,638.52 km) |
| Merthyr Tudful to Krapkowice | 926.85 mi (1,491.62 km) |
| Merthyr Tudful to Krasnik | 1,100.77 mi (1,771.51 km) |
| Merthyr Tudful to Krasnystaw | 1,140.73 mi (1,835.83 km) |
| Merthyr Tudful to Krosno | 1,102.94 mi (1,775.00 km) |
