| Gaithersburg to Borsbeek | 3,855.48 mi (6,204.80 km) |
| Gaithersburg to Boussu | 3,847.42 mi (6,191.83 km) |
| Gaithersburg to Braine-l'Alleud | 3,864.43 mi (6,219.19 km) |
| Gaithersburg to Braine-le-Chateau | 3,860.10 mi (6,212.23 km) |
| Gaithersburg to Braine-le-Comte | 3,856.84 mi (6,206.98 km) |
| Gaithersburg to Brasschaat | 3,853.34 mi (6,201.34 km) |
| Gaithersburg to Brecht | 3,857.64 mi (6,208.27 km) |
| Gaithersburg to Bredene | 3,793.88 mi (6,105.67 km) |
| Gaithersburg to Bree | 3,901.34 mi (6,278.60 km) |
| Gaithersburg to Bruges | 3,804.54 mi (6,122.81 km) |
| Gaithersburg to Brussels | 3,859.34 mi (6,211.00 km) |
| Gaithersburg to Buggenhout | 3,849.22 mi (6,194.72 km) |
| Gaithersburg to Chapelle-lez-Herlaimont | 3,866.41 mi (6,222.39 km) |
| Gaithersburg to Charleroi | 3,874.27 mi (6,235.03 km) |
| Gaithersburg to Chatelet | 3,877.66 mi (6,240.50 km) |
