| Potomac to Borgosatollo | 4,267.03 mi (6,867.12 km) |
| Potomac to Borgosesia | 4,174.80 mi (6,718.70 km) |
| Potomac to Boscoreale | 4,615.91 mi (7,428.59 km) |
| Potomac to Boscotrecase | 4,614.56 mi (7,426.42 km) |
| Potomac to Botticino Sera | 4,264.87 mi (6,863.65 km) |
| Potomac to Bovalino Marina | 4,790.00 mi (7,708.76 km) |
| Potomac to Boves | 4,187.38 mi (6,738.94 km) |
| Potomac to Boville Ernica | 4,538.79 mi (7,304.47 km) |
| Potomac to Bovisio Masciago | 4,215.87 mi (6,784.79 km) |
| Potomac to Bovolone | 4,312.59 mi (6,940.44 km) |
| Potomac to Bra | 4,188.87 mi (6,741.33 km) |
| Potomac to Bracciano | 4,466.19 mi (7,187.64 km) |
| Potomac to Brandizzo | 4,173.28 mi (6,716.25 km) |
| Potomac to Breganze | 4,316.00 mi (6,945.93 km) |
| Potomac to Brembate | 4,233.53 mi (6,813.20 km) |
