| Castel Gandolfo to Bougival | 707.89 mi (1,139.25 km) |
| Castel Gandolfo to Bouguenais | 795.93 mi (1,280.92 km) |
| Castel Gandolfo to Boulogne-Billancourt | 703.04 mi (1,131.43 km) |
| Castel Gandolfo to Boulogne-sur-Mer | 812.57 mi (1,307.70 km) |
| Castel Gandolfo to Bourg-de-Peage | 443.99 mi (714.54 km) |
| Castel Gandolfo to Bourg-en-Bresse | 480.39 mi (773.11 km) |
| Castel Gandolfo to Bourg-la-Reine | 697.98 mi (1,123.29 km) |
| Castel Gandolfo to Bourg-les-Valence | 447.82 mi (720.69 km) |
| Castel Gandolfo to Bourges | 625.39 mi (1,006.47 km) |
| Castel Gandolfo to Bourgoin-Jallieu | 453.95 mi (730.57 km) |
| Castel Gandolfo to Bressuire | 737.69 mi (1,187.19 km) |
| Castel Gandolfo to Brest | 951.11 mi (1,530.67 km) |
| Castel Gandolfo to Bretigny-sur-Orge | 690.85 mi (1,111.82 km) |
| Castel Gandolfo to Breuillet | 693.64 mi (1,116.31 km) |
| Castel Gandolfo to Briancon | 372.41 mi (599.33 km) |
