| Potomac to Bougival | 3,823.51 mi (6,153.35 km) |
| Potomac to Bouguenais | 3,703.94 mi (5,960.91 km) |
| Potomac to Boulogne-Billancourt | 3,828.56 mi (6,161.47 km) |
| Potomac to Boulogne-sur-Mer | 3,755.46 mi (6,043.82 km) |
| Potomac to Bourg-de-Peage | 4,055.77 mi (6,527.14 km) |
| Potomac to Bourg-en-Bresse | 4,028.93 mi (6,483.93 km) |
| Potomac to Bourg-la-Reine | 3,833.13 mi (6,168.82 km) |
| Potomac to Bourg-les-Valence | 4,051.67 mi (6,520.53 km) |
| Potomac to Bourges | 3,881.50 mi (6,246.67 km) |
| Potomac to Bourgoin-Jallieu | 4,049.19 mi (6,516.54 km) |
| Potomac to Bressuire | 3,762.13 mi (6,054.57 km) |
| Potomac to Brest | 3,550.42 mi (5,713.84 km) |
| Potomac to Bretigny-sur-Orge | 3,837.10 mi (6,175.21 km) |
| Potomac to Breuillet | 3,832.58 mi (6,167.94 km) |
| Potomac to Briancon | 4,129.64 mi (6,646.02 km) |
