| Gaithersburg to Bierun | 4,459.84 mi (7,177.42 km) |
| Gaithersburg to Bierun Stary | 4,461.14 mi (7,179.50 km) |
| Gaithersburg to Bilgoraj | 4,579.68 mi (7,370.29 km) |
| Gaithersburg to Biskupiec | 4,394.20 mi (7,071.78 km) |
| Gaithersburg to Blachownia | 4,431.56 mi (7,131.91 km) |
| Gaithersburg to Blonie | 4,441.48 mi (7,147.87 km) |
| Gaithersburg to Bochnia | 4,515.56 mi (7,267.10 km) |
| Gaithersburg to Bogatynia | 4,275.47 mi (6,880.71 km) |
| Gaithersburg to Boguszow-Gorce | 4,327.64 mi (6,964.66 km) |
| Gaithersburg to Boleslawiec | 4,286.81 mi (6,898.95 km) |
| Gaithersburg to Braniewo | 4,336.54 mi (6,978.99 km) |
| Gaithersburg to Brodnica | 4,360.07 mi (7,016.86 km) |
| Gaithersburg to Brwinow | 4,447.20 mi (7,157.08 km) |
| Gaithersburg to Brzeg | 4,372.87 mi (7,037.46 km) |
| Gaithersburg to Brzeg Dolny | 4,330.28 mi (6,968.91 km) |
