| Gaithersburg to Borgosatollo | 4,262.78 mi (6,860.29 km) |
| Gaithersburg to Borgosesia | 4,170.62 mi (6,711.97 km) |
| Gaithersburg to Boscoreale | 4,612.02 mi (7,422.33 km) |
| Gaithersburg to Boscotrecase | 4,610.67 mi (7,420.16 km) |
| Gaithersburg to Botticino Sera | 4,260.62 mi (6,856.81 km) |
| Gaithersburg to Bovalino Marina | 4,786.32 mi (7,702.84 km) |
| Gaithersburg to Boves | 4,183.42 mi (6,732.56 km) |
| Gaithersburg to Boville Ernica | 4,534.85 mi (7,298.14 km) |
| Gaithersburg to Bovisio Masciago | 4,211.66 mi (6,778.01 km) |
| Gaithersburg to Bovolone | 4,308.33 mi (6,933.59 km) |
| Gaithersburg to Bra | 4,184.84 mi (6,734.85 km) |
| Gaithersburg to Bracciano | 4,462.27 mi (7,181.33 km) |
| Gaithersburg to Brandizzo | 4,169.19 mi (6,709.67 km) |
| Gaithersburg to Breganze | 4,311.67 mi (6,938.95 km) |
| Gaithersburg to Brembate | 4,229.30 mi (6,806.40 km) |
