| Harpenden to Bispham | 179.85 mi (289.43 km) |
| Harpenden to Blackburn | 160.33 mi (258.03 km) |
| Harpenden to Blackpool | 178.09 mi (286.61 km) |
| Harpenden to Blairgowrie | 351.18 mi (565.17 km) |
| Harpenden to Blandford Forum | 102.64 mi (165.18 km) |
| Harpenden to Blaydon | 224.50 mi (361.29 km) |
| Harpenden to Bletchley | 20.26 mi (32.61 km) |
| Harpenden to Bloxwich | 88.97 mi (143.19 km) |
| Harpenden to Blunsdon Saint Andrew | 63.19 mi (101.69 km) |
| Harpenden to Blyth | 233.52 mi (375.82 km) |
| Harpenden to Bo'ness | 318.89 mi (513.20 km) |
| Harpenden to Bodmin | 210.98 mi (339.54 km) |
| Harpenden to Bognor Regis | 72.88 mi (117.28 km) |
| Harpenden to Bolsover | 105.24 mi (169.36 km) |
| Harpenden to Bolton | 149.51 mi (240.61 km) |
