| Harpenden to Kidderminster | 89.64 mi (144.26 km) |
| Harpenden to Kidlington | 40.09 mi (64.52 km) |
| Harpenden to Kidsgrove | 118.60 mi (190.87 km) |
| Harpenden to Killamarsh | 111.38 mi (179.25 km) |
| Harpenden to Killingworth | 227.54 mi (366.18 km) |
| Harpenden to Kilmarnock | 311.98 mi (502.08 km) |
| Harpenden to Kilsyth | 324.69 mi (522.54 km) |
| Harpenden to Kilwinning | 319.11 mi (513.55 km) |
| Harpenden to King's Lynn | 72.06 mi (115.97 km) |
| Harpenden to Kings Norton | 78.26 mi (125.95 km) |
| Harpenden to Kingsnorth | 71.18 mi (114.56 km) |
| Harpenden to Kingsteignton | 165.68 mi (266.64 km) |
| Harpenden to Kingston upon Hull | 133.14 mi (214.27 km) |
| Harpenden to Kingston upon Thames | 28.23 mi (45.43 km) |
| Harpenden to Kingswinford | 90.10 mi (145.01 km) |
