| Southborough to Bountiful (Utah) | 4,882.68 mi (7,857.92 km) |
| Southborough to Bourbonnais (Illinois) | 4,015.58 mi (6,462.45 km) |
| Southborough to Bowie (Maryland) | 3,674.10 mi (5,912.89 km) |
| Southborough to Bowling Green (Kentucky) | 4,158.11 mi (6,691.83 km) |
| Southborough to Bowling Green (Ohio) | 3,842.61 mi (6,184.09 km) |
| Southborough to Box Elder (South Dakota) | 4,422.66 mi (7,117.58 km) |
| Southborough to Boynton Beach (Florida) | 4,406.06 mi (7,090.87 km) |
| Southborough to Bozeman (Montana) | 4,597.99 mi (7,399.75 km) |
| Southborough to Bradenton (Florida) | 4,463.71 mi (7,183.65 km) |
| Southborough to Bradfordville (Florida) | 4,378.52 mi (7,046.55 km) |
| Southborough to Bradley (Illinois) | 4,015.19 mi (6,461.82 km) |
| Southborough to Bradley Gardens (New Jersey) | 3,518.14 mi (5,661.89 km) |
| Southborough to Brainerd (Minnesota) | 4,007.26 mi (6,449.07 km) |
| Southborough to Brambleton (Virginia) | 3,705.39 mi (5,963.25 km) |
| Southborough to Brandermill (Virginia) | 3,780.21 mi (6,083.66 km) |
