| South Portland to Belvedere Marittimo | 4,248.32 mi (6,837.02 km) |
| South Portland to Benevento | 4,142.30 mi (6,666.39 km) |
| South Portland to Bergamo | 3,759.59 mi (6,050.48 km) |
| South Portland to Bernalda | 4,252.36 mi (6,843.52 km) |
| South Portland to Bertinoro | 3,917.22 mi (6,304.16 km) |
| South Portland to Besana in Brianza | 3,743.06 mi (6,023.87 km) |
| South Portland to Besozzo | 3,711.99 mi (5,973.87 km) |
| South Portland to Biancavilla | 4,281.98 mi (6,891.18 km) |
| South Portland to Biassono | 3,744.56 mi (6,026.29 km) |
| South Portland to Bibbiano | 3,828.19 mi (6,160.88 km) |
| South Portland to Bibbiena | 3,919.67 mi (6,308.11 km) |
| South Portland to Biella | 3,695.71 mi (5,947.66 km) |
| South Portland to Bisceglie | 4,212.37 mi (6,779.15 km) |
| South Portland to Bisignano | 4,270.48 mi (6,872.68 km) |
| South Portland to Bitetto | 4,231.06 mi (6,809.23 km) |
