| Boulogne-sur-Mer to Bitritto | 987.78 mi (1,589.68 km) |
| Boulogne-sur-Mer to Bollate | 497.08 mi (799.97 km) |
| Boulogne-sur-Mer to Bologna | 624.16 mi (1,004.49 km) |
| Boulogne-sur-Mer to Bolzano | 531.62 mi (855.55 km) |
| Boulogne-sur-Mer to Bomporto | 601.68 mi (968.31 km) |
| Boulogne-sur-Mer to Bonate di Sopra | 504.94 mi (812.63 km) |
| Boulogne-sur-Mer to Bondeno | 607.29 mi (977.33 km) |
| Boulogne-sur-Mer to Bordighera | 556.96 mi (896.33 km) |
| Boulogne-sur-Mer to Borgaro Torinese | 475.57 mi (765.35 km) |
| Boulogne-sur-Mer to Borgo a Buggiano | 636.30 mi (1,024.03 km) |
| Boulogne-sur-Mer to Borgo San Dalmazzo | 519.31 mi (835.75 km) |
| Boulogne-sur-Mer to Borgo San Lorenzo | 653.48 mi (1,051.68 km) |
| Boulogne-sur-Mer to Borgomanero | 468.79 mi (754.45 km) |
| Boulogne-sur-Mer to Borgoricco | 597.04 mi (960.84 km) |
| Boulogne-sur-Mer to Borgosatollo | 537.86 mi (865.61 km) |
