| Potomac to Borsbeek | 3,860.24 mi (6,212.46 km) |
| Potomac to Boussu | 3,852.05 mi (6,199.28 km) |
| Potomac to Braine-l'Alleud | 3,869.11 mi (6,226.73 km) |
| Potomac to Braine-le-Chateau | 3,864.78 mi (6,219.76 km) |
| Potomac to Braine-le-Comte | 3,861.50 mi (6,214.49 km) |
| Potomac to Brasschaat | 3,858.11 mi (6,209.02 km) |
| Potomac to Brecht | 3,862.42 mi (6,215.97 km) |
| Potomac to Bredene | 3,798.60 mi (6,113.25 km) |
| Potomac to Bree | 3,906.13 mi (6,286.30 km) |
| Potomac to Bruges | 3,809.26 mi (6,130.41 km) |
| Potomac to Brussels | 3,864.04 mi (6,218.57 km) |
| Potomac to Buggenhout | 3,853.94 mi (6,202.32 km) |
| Potomac to Chapelle-lez-Herlaimont | 3,871.06 mi (6,229.87 km) |
| Potomac to Charleroi | 3,878.91 mi (6,242.51 km) |
| Potomac to Chatelet | 3,882.31 mi (6,247.98 km) |
