| South Portland to Barberino di Mugello | 3,884.30 mi (6,251.17 km) |
| South Portland to Barcellona-Pozzo di Gotto | 4,277.68 mi (6,884.26 km) |
| South Portland to Bareggio | 3,738.04 mi (6,015.79 km) |
| South Portland to Barga | 3,849.26 mi (6,194.78 km) |
| South Portland to Bari | 4,232.47 mi (6,811.51 km) |
| South Portland to Barletta | 4,199.97 mi (6,759.21 km) |
| South Portland to Baronissi | 4,156.57 mi (6,689.36 km) |
| South Portland to Barrafranca | 4,263.37 mi (6,861.24 km) |
| South Portland to Bassano del Grappa | 3,844.02 mi (6,186.35 km) |
| South Portland to Battipaglia | 4,170.82 mi (6,712.28 km) |
| South Portland to Beinasco | 3,692.94 mi (5,943.22 km) |
| South Portland to Bellinzago Novarese | 3,719.30 mi (5,985.64 km) |
| South Portland to Belluno | 3,851.34 mi (6,198.14 km) |
| South Portland to Belmonte Mezzagno | 4,199.77 mi (6,758.88 km) |
| South Portland to Belpasso | 4,289.85 mi (6,903.85 km) |
