| Harrow to Bougival | 217.59 mi (350.17 km) |
| Harrow to Bouguenais | 309.77 mi (498.53 km) |
| Harrow to Boulogne-Billancourt | 221.66 mi (356.73 km) |
| Harrow to Boulogne-sur-Mer | 103.58 mi (166.70 km) |
| Harrow to Bourg-de-Peage | 515.46 mi (829.55 km) |
| Harrow to Bourg-en-Bresse | 449.39 mi (723.23 km) |
| Harrow to Bourg-la-Reine | 226.68 mi (364.81 km) |
| Harrow to Bourg-les-Valence | 517.71 mi (833.17 km) |
| Harrow to Bourges | 334.43 mi (538.22 km) |
| Harrow to Bourgoin-Jallieu | 487.21 mi (784.09 km) |
| Harrow to Bressuire | 327.81 mi (527.57 km) |
| Harrow to Brest | 287.26 mi (462.30 km) |
| Harrow to Bretigny-sur-Orge | 236.59 mi (380.75 km) |
| Harrow to Breuillet | 236.47 mi (380.56 km) |
| Harrow to Briancon | 562.23 mi (904.82 km) |
