| Gaithersburg to Bougival | 3,819.16 mi (6,146.34 km) |
| Gaithersburg to Bouguenais | 3,699.98 mi (5,954.54 km) |
| Gaithersburg to Boulogne-Billancourt | 3,824.21 mi (6,154.47 km) |
| Gaithersburg to Boulogne-sur-Mer | 3,750.86 mi (6,036.42 km) |
| Gaithersburg to Bourg-de-Peage | 4,051.83 mi (6,520.79 km) |
| Gaithersburg to Bourg-en-Bresse | 4,024.82 mi (6,477.32 km) |
| Gaithersburg to Bourg-la-Reine | 3,828.78 mi (6,161.83 km) |
| Gaithersburg to Bourg-les-Valence | 4,047.74 mi (6,514.21 km) |
| Gaithersburg to Bourges | 3,877.39 mi (6,240.06 km) |
| Gaithersburg to Bourgoin-Jallieu | 4,045.16 mi (6,510.06 km) |
| Gaithersburg to Bressuire | 3,758.17 mi (6,048.20 km) |
| Gaithersburg to Brest | 3,546.37 mi (5,707.34 km) |
| Gaithersburg to Bretigny-sur-Orge | 3,832.78 mi (6,168.26 km) |
| Gaithersburg to Breuillet | 3,828.27 mi (6,161.00 km) |
| Gaithersburg to Briancon | 4,125.65 mi (6,639.59 km) |
