| Southborough to Bollullos par del Condado | 1,011.65 mi (1,628.10 km) |
| Southborough to Bormujos | 1,002.25 mi (1,612.97 km) |
| Southborough to Brenes | 987.07 mi (1,588.53 km) |
| Southborough to Brunete | 770.89 mi (1,240.63 km) |
| Southborough to Bueu | 745.05 mi (1,199.04 km) |
| Southborough to Bullas | 910.73 mi (1,465.67 km) |
| Southborough to Bunol | 812.78 mi (1,308.05 km) |
| Southborough to Burela de Cabo | 629.90 mi (1,013.73 km) |
| Southborough to Burgos | 637.34 mi (1,025.71 km) |
| Southborough to Burjasot | 805.82 mi (1,296.85 km) |
| Southborough to Burriana | 778.90 mi (1,253.52 km) |
| Southborough to Cabanaquinta | 620.56 mi (998.70 km) |
| Southborough to Cabanillas del Campo | 745.97 mi (1,200.52 km) |
| Southborough to Cabra | 973.68 mi (1,566.99 km) |
| Southborough to Caceres | 867.84 mi (1,396.66 km) |
