| Harrow to Benisa | 889.38 mi (1,431.32 km) |
| Harrow to Berga | 663.31 mi (1,067.49 km) |
| Harrow to Berja | 1,026.26 mi (1,651.60 km) |
| Harrow to Bermeo | 574.80 mi (925.05 km) |
| Harrow to Berriozar | 607.56 mi (977.77 km) |
| Harrow to Betanzos | 680.54 mi (1,095.22 km) |
| Harrow to Betera | 828.54 mi (1,333.41 km) |
| Harrow to Bilbao | 587.70 mi (945.81 km) |
| Harrow to Binefar | 673.22 mi (1,083.44 km) |
| Harrow to Binisalem | 836.26 mi (1,345.83 km) |
| Harrow to Blanes | 700.52 mi (1,127.38 km) |
| Harrow to Boadilla del Monte | 790.35 mi (1,271.94 km) |
| Harrow to Boiro | 735.61 mi (1,183.84 km) |
| Harrow to Bolanos de Calatrava | 892.46 mi (1,436.27 km) |
| Harrow to Bollullos de la Mitacion | 1,024.31 mi (1,648.47 km) |
