| Harpenden to Kamen | 343.48 mi (552.78 km) |
| Harpenden to Kamenz | 621.19 mi (999.71 km) |
| Harpenden to Kamp-Lintfort | 295.84 mi (476.10 km) |
| Harpenden to Kandel | 420.67 mi (677.00 km) |
| Harpenden to Kappeln | 467.85 mi (752.93 km) |
| Harpenden to Karben | 410.91 mi (661.29 km) |
| Harpenden to Karlsdorf-Neuthard | 432.43 mi (695.93 km) |
| Harpenden to Karlsfeld | 579.81 mi (933.12 km) |
| Harpenden to Karlsruhe | 431.23 mi (693.99 km) |
| Harpenden to Kassel | 424.15 mi (682.60 km) |
| Harpenden to Kaufbeuren | 558.72 mi (899.18 km) |
| Harpenden to Kaufering | 561.39 mi (903.46 km) |
| Harpenden to Kaufungen | 429.67 mi (691.48 km) |
| Harpenden to Kehl | 425.10 mi (684.13 km) |
| Harpenden to Kelheim | 573.75 mi (923.37 km) |
