| Harpenden to Jicin | 686.25 mi (1,104.41 km) |
| Harpenden to Jihlava | 717.14 mi (1,154.13 km) |
| Harpenden to Jindrichuv Hradec | 698.46 mi (1,124.06 km) |
| Harpenden to Jirkov | 603.95 mi (971.97 km) |
| Harpenden to Kadan | 598.56 mi (963.29 km) |
| Harpenden to Karlovy Vary | 584.25 mi (940.26 km) |
| Harpenden to Karvina | 833.14 mi (1,340.81 km) |
| Harpenden to Kladno | 637.99 mi (1,026.75 km) |
| Harpenden to Klasterec nad Ohri | 594.15 mi (956.20 km) |
| Harpenden to Klatovy | 620.34 mi (998.35 km) |
| Harpenden to Kolin | 687.20 mi (1,105.94 km) |
| Harpenden to Koprivnice | 821.37 mi (1,321.86 km) |
| Harpenden to Kralupy nad Vltavou | 645.31 mi (1,038.52 km) |
| Harpenden to Kraluv Dvur | 639.15 mi (1,028.61 km) |
| Harpenden to Krnov | 792.57 mi (1,275.52 km) |
