| Rockville to Buena Park (California) | 2,278.86 mi (3,667.47 km) |
| Rockville to Buenaventura Lakes (Florida) | 780.61 mi (1,256.27 km) |
| Rockville to Buffalo (Minnesota) | 951.69 mi (1,531.59 km) |
| Rockville to Buffalo (New York) | 278.20 mi (447.71 km) |
| Rockville to Buffalo Grove (Illinois) | 604.88 mi (973.47 km) |
| Rockville to Buford (Georgia) | 510.96 mi (822.31 km) |
| Rockville to Bull Run (Virginia) | 28.70 mi (46.19 km) |
| Rockville to Bullhead City (Arizona) | 2,063.94 mi (3,321.59 km) |
| Rockville to Burbank (California) | 2,287.75 mi (3,681.78 km) |
| Rockville to Burbank (Illinois) | 587.35 mi (945.25 km) |
| Rockville to Burien (Washington) | 2,310.72 mi (3,718.74 km) |
| Rockville to Burkburnett (Texas) | 1,234.06 mi (1,986.03 km) |
| Rockville to Burke (Virginia) | 21.93 mi (35.30 km) |
| Rockville to Burke Centre (Virginia) | 21.69 mi (34.91 km) |
| Rockville to Burleson (Texas) | 1,215.09 mi (1,955.49 km) |
