| Harrow to Borgosatollo | 641.29 mi (1,032.06 km) |
| Harrow to Borgosesia | 563.98 mi (907.64 km) |
| Harrow to Boscoreale | 1,026.71 mi (1,652.33 km) |
| Harrow to Boscotrecase | 1,025.27 mi (1,650.02 km) |
| Harrow to Botticino Sera | 638.27 mi (1,027.20 km) |
| Harrow to Bovalino Marina | 1,225.24 mi (1,971.83 km) |
| Harrow to Boves | 619.26 mi (996.61 km) |
| Harrow to Boville Ernica | 946.05 mi (1,522.52 km) |
| Harrow to Bovisio Masciago | 597.64 mi (961.81 km) |
| Harrow to Bovolone | 683.20 mi (1,099.50 km) |
| Harrow to Bra | 606.68 mi (976.36 km) |
| Harrow to Bracciano | 880.76 mi (1,417.44 km) |
| Harrow to Brandizzo | 579.82 mi (933.13 km) |
| Harrow to Breganze | 677.64 mi (1,090.56 km) |
| Harrow to Brembate | 611.78 mi (984.56 km) |
