| Southborough to Blue Springs (Missouri) | 4,362.79 mi (7,021.23 km) |
| Southborough to Bluffdale (Utah) | 4,906.72 mi (7,896.60 km) |
| Southborough to Bluffton (Indiana) | 3,931.20 mi (6,326.65 km) |
| Southborough to Bluffton (South Carolina) | 4,161.96 mi (6,698.02 km) |
| Southborough to Blythe (California) | 5,374.62 mi (8,649.62 km) |
| Southborough to Blytheville (Arkansas) | 4,345.86 mi (6,993.99 km) |
| Southborough to Boca Raton (Florida) | 4,414.86 mi (7,105.03 km) |
| Southborough to Boerne (Texas) | 5,004.65 mi (8,054.21 km) |
| Southborough to Bogalusa (Louisiana) | 4,600.52 mi (7,403.82 km) |
| Southborough to Boiling Springs (South Carolina) | 4,069.48 mi (6,549.19 km) |
| Southborough to Boise (Idaho) | 4,868.04 mi (7,834.35 km) |
| Southborough to Bolingbrook (Illinois) | 4,000.54 mi (6,438.25 km) |
| Southborough to Bolivar (Missouri) | 4,399.83 mi (7,080.84 km) |
| Southborough to Bon Air (Virginia) | 3,773.02 mi (6,072.08 km) |
| Southborough to Bonham (Texas) | 4,708.77 mi (7,578.04 km) |
