| Gaithersburg to Bitonto | 4,695.26 mi (7,556.30 km) |
| Gaithersburg to Bitritto | 4,704.32 mi (7,570.87 km) |
| Gaithersburg to Bollate | 4,212.38 mi (6,779.16 km) |
| Gaithersburg to Bologna | 4,342.74 mi (6,988.96 km) |
| Gaithersburg to Bolzano | 4,276.27 mi (6,882.00 km) |
| Gaithersburg to Bomporto | 4,321.38 mi (6,954.58 km) |
| Gaithersburg to Bonate di Sopra | 4,227.32 mi (6,803.21 km) |
| Gaithersburg to Bondeno | 4,332.73 mi (6,972.86 km) |
| Gaithersburg to Bordighera | 4,206.19 mi (6,769.21 km) |
| Gaithersburg to Borgaro Torinese | 4,161.88 mi (6,697.91 km) |
| Gaithersburg to Borgo a Buggiano | 4,337.10 mi (6,979.89 km) |
| Gaithersburg to Borgo San Dalmazzo | 4,180.49 mi (6,727.85 km) |
| Gaithersburg to Borgo San Lorenzo | 4,362.99 mi (7,021.56 km) |
| Gaithersburg to Borgomanero | 4,179.73 mi (6,726.63 km) |
| Gaithersburg to Borgoricco | 4,334.72 mi (6,976.05 km) |
