| Harpenden to Jozefow | 915.59 mi (1,473.49 km) |
| Harpenden to Kalisz | 785.70 mi (1,264.47 km) |
| Harpenden to Kamien Pomorski | 646.40 mi (1,040.29 km) |
| Harpenden to Kamienna Gora | 709.94 mi (1,142.53 km) |
| Harpenden to Karczew | 916.73 mi (1,475.33 km) |
| Harpenden to Kartuzy | 786.98 mi (1,266.52 km) |
| Harpenden to Katowice | 845.68 mi (1,360.99 km) |
| Harpenden to Kedzierzyn-Kozle | 809.35 mi (1,302.53 km) |
| Harpenden to Kepno | 786.56 mi (1,265.84 km) |
| Harpenden to Ketrzyn | 914.50 mi (1,471.74 km) |
| Harpenden to Kety | 861.02 mi (1,385.67 km) |
| Harpenden to Kielce | 904.87 mi (1,456.25 km) |
| Harpenden to Kielczow | 753.99 mi (1,213.43 km) |
| Harpenden to Klobuck | 831.80 mi (1,338.66 km) |
| Harpenden to Klodzko | 741.74 mi (1,193.72 km) |
