| Southborough to Bridgeton (Missouri) | 4,228.29 mi (6,804.78 km) |
| Southborough to Bridgetown (Ohio) | 3,983.48 mi (6,410.79 km) |
| Southborough to Bridgeview (Illinois) | 3,986.93 mi (6,416.34 km) |
| Southborough to Brigham City (Utah) | 4,854.10 mi (7,811.93 km) |
| Southborough to Brighton (Colorado) | 4,694.63 mi (7,555.27 km) |
| Southborough to Bristol (Connecticut) | 3,400.08 mi (5,471.89 km) |
| Southborough to Bristol (Tennessee) | 4,007.71 mi (6,449.79 km) |
| Southborough to Bristol (Virginia) | 4,002.61 mi (6,441.58 km) |
| Southborough to Broadlands (Virginia) | 3,703.12 mi (5,959.59 km) |
| Southborough to Broadview Heights (Ohio) | 3,767.59 mi (6,063.36 km) |
| Southborough to Brock Hall (Maryland) | 3,678.54 mi (5,920.03 km) |
| Southborough to Brockton (Massachusetts) | 3,304.76 mi (5,318.49 km) |
| Southborough to Broken Arrow (Oklahoma) | 4,568.42 mi (7,352.16 km) |
| Southborough to Bronx (New York) | 3,473.29 mi (5,589.71 km) |
| Southborough to Brook Park (Ohio) | 3,769.53 mi (6,066.48 km) |
