| Portsmouth to Borgosatollo | 637.91 mi (1,026.61 km) |
| Portsmouth to Borgosesia | 554.93 mi (893.08 km) |
| Portsmouth to Boscoreale | 1,017.91 mi (1,638.17 km) |
| Portsmouth to Boscotrecase | 1,016.48 mi (1,635.86 km) |
| Portsmouth to Botticino Sera | 635.16 mi (1,022.19 km) |
| Portsmouth to Bovalino Marina | 1,214.08 mi (1,953.87 km) |
| Portsmouth to Boves | 600.96 mi (967.15 km) |
| Portsmouth to Boville Ernica | 937.21 mi (1,508.29 km) |
| Portsmouth to Bovisio Masciago | 591.32 mi (951.64 km) |
| Portsmouth to Bovolone | 681.45 mi (1,096.68 km) |
| Portsmouth to Bra | 591.09 mi (951.27 km) |
| Portsmouth to Bracciano | 869.83 mi (1,399.86 km) |
| Portsmouth to Brandizzo | 566.36 mi (911.47 km) |
| Portsmouth to Breganze | 679.35 mi (1,093.30 km) |
| Portsmouth to Brembate | 606.76 mi (976.48 km) |
