| Harpenden to Barking | 26.66 mi (42.91 km) |
| Harpenden to Barnet | 13.63 mi (21.93 km) |
| Harpenden to Barnoldswick | 163.90 mi (263.77 km) |
| Harpenden to Barnsley | 128.97 mi (207.55 km) |
| Harpenden to Barnstaple | 167.56 mi (269.66 km) |
| Harpenden to Barrhead | 320.62 mi (515.98 km) |
| Harpenden to Barri | 128.38 mi (206.60 km) |
| Harpenden to Barrow in Furness | 198.48 mi (319.43 km) |
| Harpenden to Barton upon Humber | 128.98 mi (207.57 km) |
| Harpenden to Barton upon Irwell | 142.16 mi (228.79 km) |
| Harpenden to Barwell | 66.80 mi (107.50 km) |
| Harpenden to Basford | 87.26 mi (140.43 km) |
| Harpenden to Basildon | 39.63 mi (63.78 km) |
| Harpenden to Basingstoke | 49.46 mi (79.60 km) |
| Harpenden to Bath | 91.31 mi (146.95 km) |
