| South Portland to Beocin | 4,193.84 mi (6,749.34 km) |
| South Portland to Blace | 4,332.07 mi (6,971.80 km) |
| South Portland to Bogatic | 4,197.85 mi (6,755.79 km) |
| South Portland to Bojnik | 4,360.95 mi (7,018.27 km) |
| South Portland to Boljevac | 4,337.81 mi (6,981.03 km) |
| South Portland to Bor | 4,331.67 mi (6,971.15 km) |
| South Portland to Borca | 4,235.60 mi (6,816.54 km) |
| South Portland to Bosilegrad | 4,412.80 mi (7,101.72 km) |
| South Portland to Brus | 4,318.07 mi (6,949.25 km) |
| South Portland to Bujanovac | 4,385.15 mi (7,057.22 km) |
| South Portland to Cacak | 4,269.92 mi (6,871.77 km) |
| South Portland to Cajetina | 4,249.52 mi (6,838.95 km) |
| South Portland to Cicevac | 4,321.75 mi (6,955.19 km) |
| South Portland to Coka | 4,182.38 mi (6,730.88 km) |
| South Portland to Crna Trava | 4,393.03 mi (7,069.89 km) |
