| South Portland to Bonhill | 2,929.78 mi (4,715.03 km) |
| South Portland to Bonnyrigg | 2,986.72 mi (4,806.67 km) |
| South Portland to Bootle | 3,032.71 mi (4,880.68 km) |
| South Portland to Borehamwood | 3,178.42 mi (5,115.18 km) |
| South Portland to Boscombe | 3,135.16 mi (5,045.56 km) |
| South Portland to Boston | 3,159.68 mi (5,085.02 km) |
| South Portland to Bottesford | 3,122.08 mi (5,024.50 km) |
| South Portland to Bourne | 3,149.92 mi (5,069.31 km) |
| South Portland to Bournemouth | 3,133.62 mi (5,043.07 km) |
| South Portland to Bournville | 3,094.66 mi (4,980.37 km) |
| South Portland to Bovingdon | 3,166.25 mi (5,095.58 km) |
| South Portland to Bowdon | 3,058.71 mi (4,922.52 km) |
| South Portland to Boxley | 3,219.66 mi (5,181.55 km) |
| South Portland to Brackley | 3,134.80 mi (5,044.97 km) |
| South Portland to Bracknell | 3,164.48 mi (5,092.73 km) |
