| Harpenden to Bilecik | 1,647.66 mi (2,651.65 km) |
| Harpenden to Bingol | 2,140.01 mi (3,444.01 km) |
| Harpenden to Birecik | 2,116.28 mi (3,405.83 km) |
| Harpenden to Bitlis | 2,228.82 mi (3,586.94 km) |
| Harpenden to Bodrum | 1,691.89 mi (2,722.84 km) |
| Harpenden to Bogazliyan | 1,906.24 mi (3,067.80 km) |
| Harpenden to Bolu | 1,689.09 mi (2,718.33 km) |
| Harpenden to Bolvadin | 1,755.05 mi (2,824.49 km) |
| Harpenden to Bor | 1,936.43 mi (3,116.38 km) |
| Harpenden to Borcka | 2,088.30 mi (3,360.80 km) |
| Harpenden to Boyabat | 1,791.17 mi (2,882.61 km) |
| Harpenden to Bozdogan | 1,695.05 mi (2,727.93 km) |
| Harpenden to Bozkir | 1,874.24 mi (3,016.29 km) |
| Harpenden to Bozkurt | 1,739.55 mi (2,799.54 km) |
| Harpenden to Bozuyuk | 1,660.37 mi (2,672.11 km) |
