| Gaithersburg to Bicaz | 4,849.33 mi (7,804.24 km) |
| Gaithersburg to Bistrita | 4,779.74 mi (7,692.25 km) |
| Gaithersburg to Blaj | 4,795.73 mi (7,717.98 km) |
| Gaithersburg to Bocsa | 4,740.66 mi (7,629.36 km) |
| Gaithersburg to Boldesti-Scaeni | 4,924.99 mi (7,926.01 km) |
| Gaithersburg to Bolintin Vale | 4,938.63 mi (7,947.95 km) |
| Gaithersburg to Borsa | 4,764.94 mi (7,668.43 km) |
| Gaithersburg to Botosani | 4,836.45 mi (7,783.52 km) |
| Gaithersburg to Brad | 4,753.63 mi (7,650.23 km) |
| Gaithersburg to Bragadiru | 4,950.38 mi (7,966.87 km) |
| Gaithersburg to Braila | 4,989.26 mi (8,029.44 km) |
| Gaithersburg to Brasov | 4,882.52 mi (7,857.65 km) |
| Gaithersburg to Breaza | 4,904.13 mi (7,892.44 km) |
| Gaithersburg to Bucharest | 4,952.86 mi (7,970.86 km) |
| Gaithersburg to Buftea | 4,941.07 mi (7,951.89 km) |
