| Harpenden to Bougival | 231.67 mi (372.84 km) |
| Harpenden to Bouguenais | 325.60 mi (524.00 km) |
| Harpenden to Boulogne-Billancourt | 235.64 mi (379.23 km) |
| Harpenden to Boulogne-sur-Mer | 113.63 mi (182.87 km) |
| Harpenden to Bourg-de-Peage | 529.54 mi (852.21 km) |
| Harpenden to Bourg-en-Bresse | 462.64 mi (744.55 km) |
| Harpenden to Bourg-la-Reine | 240.62 mi (387.25 km) |
| Harpenden to Bourg-les-Valence | 531.93 mi (856.05 km) |
| Harpenden to Bourges | 349.49 mi (562.45 km) |
| Harpenden to Bourgoin-Jallieu | 500.84 mi (806.02 km) |
| Harpenden to Bressuire | 343.97 mi (553.56 km) |
| Harpenden to Brest | 299.40 mi (481.84 km) |
| Harpenden to Bretigny-sur-Orge | 250.73 mi (403.51 km) |
| Harpenden to Breuillet | 250.82 mi (403.66 km) |
| Harpenden to Briancon | 575.29 mi (925.84 km) |
