| Harpenden to Llantwit Major | 136.95 mi (220.40 km) |
| Harpenden to London | 23.51 mi (37.83 km) |
| Harpenden to London Colney | 6.71 mi (10.79 km) |
| Harpenden to Long Eaton | 84.12 mi (135.37 km) |
| Harpenden to Longbenton | 225.53 mi (362.95 km) |
| Harpenden to Longbridge | 79.73 mi (128.31 km) |
| Harpenden to Longton | 110.31 mi (177.52 km) |
| Harpenden to Loughborough | 74.93 mi (120.58 km) |
| Harpenden to Loughton | 21.61 mi (34.78 km) |
| Harpenden to Louth | 108.04 mi (173.87 km) |
| Harpenden to Lowestoft | 100.20 mi (161.25 km) |
| Harpenden to Lowton | 147.25 mi (236.98 km) |
| Harpenden to Ludlow | 107.38 mi (172.80 km) |
| Harpenden to Luton | 4.97 mi (8.00 km) |
| Harpenden to Lydney | 93.23 mi (150.05 km) |
