| Gaithersburg to Boekel | 3,892.33 mi (6,264.11 km) |
| Gaithersburg to Bolsward | 3,849.37 mi (6,194.96 km) |
| Gaithersburg to Borger | 3,901.64 mi (6,279.09 km) |
| Gaithersburg to Borne | 3,916.46 mi (6,302.93 km) |
| Gaithersburg to Boskoop | 3,840.03 mi (6,179.93 km) |
| Gaithersburg to Boxmeer | 3,902.25 mi (6,280.06 km) |
| Gaithersburg to Boxtel | 3,879.53 mi (6,243.50 km) |
| Gaithersburg to Breda | 3,857.19 mi (6,207.55 km) |
| Gaithersburg to Breukelen | 3,851.25 mi (6,197.99 km) |
| Gaithersburg to Brielle | 3,825.06 mi (6,155.85 km) |
| Gaithersburg to Bronkhorst | 3,900.01 mi (6,276.46 km) |
| Gaithersburg to Brummen | 3,898.71 mi (6,274.36 km) |
| Gaithersburg to Brunssum | 3,921.60 mi (6,311.21 km) |
| Gaithersburg to Bunnik | 3,863.49 mi (6,217.69 km) |
| Gaithersburg to Burgum | 3,864.00 mi (6,218.50 km) |
