| Harpenden to Lisburn | 300.09 mi (482.95 km) |
| Harpenden to Liskeard | 201.63 mi (324.50 km) |
| Harpenden to Litherland | 159.32 mi (256.40 km) |
| Harpenden to Little Bookham | 37.14 mi (59.78 km) |
| Harpenden to Little Hulton | 146.58 mi (235.89 km) |
| Harpenden to Little Lever | 147.22 mi (236.93 km) |
| Harpenden to Littleborough | 145.80 mi (234.64 km) |
| Harpenden to Littlehampton | 70.13 mi (112.86 km) |
| Harpenden to Littleover | 89.56 mi (144.13 km) |
| Harpenden to Littleport | 52.22 mi (84.05 km) |
| Harpenden to Liverpool | 155.97 mi (251.00 km) |
| Harpenden to Liversedge | 142.00 mi (228.53 km) |
| Harpenden to Livingston | 309.02 mi (497.32 km) |
| Harpenden to Llanelli | 163.24 mi (262.71 km) |
| Harpenden to Llantrisant | 130.88 mi (210.62 km) |
