| Rockville to Blue Island (Illinois) | 581.48 mi (935.80 km) |
| Rockville to Blue Springs (Missouri) | 917.12 mi (1,475.97 km) |
| Rockville to Bluffdale (Utah) | 1,837.48 mi (2,957.14 km) |
| Rockville to Bluffton (Indiana) | 439.91 mi (707.97 km) |
| Rockville to Bluffton (South Carolina) | 519.73 mi (836.42 km) |
| Rockville to Blythe (California) | 2,103.40 mi (3,385.09 km) |
| Rockville to Blytheville (Arkansas) | 731.20 mi (1,176.76 km) |
| Rockville to Boca Raton (Florida) | 894.51 mi (1,439.58 km) |
| Rockville to Boerne (Texas) | 1,382.20 mi (2,224.44 km) |
| Rockville to Bogalusa (Louisiana) | 918.85 mi (1,478.74 km) |
| Rockville to Boiling Springs (South Carolina) | 385.30 mi (620.08 km) |
| Rockville to Boise (Idaho) | 2,031.80 mi (3,269.87 km) |
| Rockville to Bolingbrook (Illinois) | 603.10 mi (970.59 km) |
| Rockville to Bolivar (Missouri) | 885.93 mi (1,425.76 km) |
| Rockville to Bon Air (Virginia) | 110.44 mi (177.73 km) |
