| Boulogne-sur-Mer to Borgosesia | 461.77 mi (743.15 km) |
| Boulogne-sur-Mer to Boscoreale | 923.94 mi (1,486.93 km) |
| Boulogne-sur-Mer to Boscotrecase | 922.50 mi (1,484.62 km) |
| Boulogne-sur-Mer to Botticino Sera | 534.82 mi (860.72 km) |
| Boulogne-sur-Mer to Bovalino Marina | 1,122.95 mi (1,807.21 km) |
| Boulogne-sur-Mer to Boves | 520.95 mi (838.38 km) |
| Boulogne-sur-Mer to Boville Ernica | 843.33 mi (1,357.21 km) |
| Boulogne-sur-Mer to Bovisio Masciago | 494.70 mi (796.14 km) |
| Boulogne-sur-Mer to Bovolone | 579.64 mi (932.84 km) |
| Boulogne-sur-Mer to Bra | 506.95 mi (815.86 km) |
| Boulogne-sur-Mer to Bracciano | 778.63 mi (1,253.09 km) |
| Boulogne-sur-Mer to Brandizzo | 479.19 mi (771.19 km) |
| Boulogne-sur-Mer to Breganze | 574.13 mi (923.97 km) |
| Boulogne-sur-Mer to Brembate | 508.58 mi (818.49 km) |
| Boulogne-sur-Mer to Brescia | 534.11 mi (859.56 km) |
