| Southborough to Buenaventura Lakes (Florida) | 4,369.96 mi (7,032.77 km) |
| Southborough to Buffalo (Minnesota) | 4,050.53 mi (6,518.70 km) |
| Southborough to Buffalo (New York) | 3,586.17 mi (5,771.38 km) |
| Southborough to Buffalo Grove (Illinois) | 3,973.06 mi (6,394.02 km) |
| Southborough to Buford (Georgia) | 4,196.31 mi (6,753.31 km) |
| Southborough to Bull Run (Virginia) | 3,713.88 mi (5,976.91 km) |
| Southborough to Bullhead City (Arizona) | 5,288.11 mi (8,510.39 km) |
| Southborough to Burbank (California) | 5,463.95 mi (8,793.38 km) |
| Southborough to Burbank (Illinois) | 3,985.28 mi (6,413.69 km) |
| Southborough to Burien (Washington) | 4,821.28 mi (7,759.10 km) |
| Southborough to Burkburnett (Texas) | 4,774.80 mi (7,684.29 km) |
| Southborough to Burke (Virginia) | 3,703.48 mi (5,960.17 km) |
| Southborough to Burke Centre (Virginia) | 3,704.39 mi (5,961.64 km) |
| Southborough to Burleson (Texas) | 4,808.11 mi (7,737.90 km) |
| Southborough to Burley (Idaho) | 4,852.55 mi (7,809.42 km) |
