| Harpenden to Kluczbork | 800.32 mi (1,287.99 km) |
| Harpenden to Knurow | 832.33 mi (1,339.50 km) |
| Harpenden to Kobylka | 912.56 mi (1,468.62 km) |
| Harpenden to Kokoszki | 798.80 mi (1,285.54 km) |
| Harpenden to Kolbuszowa | 963.39 mi (1,550.43 km) |
| Harpenden to Kolno | 937.52 mi (1,508.79 km) |
| Harpenden to Kolo | 805.58 mi (1,296.46 km) |
| Harpenden to Kolobrzeg | 680.52 mi (1,095.19 km) |
| Harpenden to Koluszki | 858.64 mi (1,381.85 km) |
| Harpenden to Komorniki | 723.68 mi (1,164.65 km) |
| Harpenden to Konin | 790.02 mi (1,271.41 km) |
| Harpenden to Konskie | 891.13 mi (1,434.13 km) |
| Harpenden to Konstancin-Jeziorna | 911.12 mi (1,466.30 km) |
| Harpenden to Konstantynow Lodzki | 838.88 mi (1,350.05 km) |
| Harpenden to Koronowo | 772.73 mi (1,243.58 km) |
