| Mason City to Bonhill | 3,785.50 mi (6,092.18 km) |
| Mason City to Bonnyrigg | 3,839.29 mi (6,178.74 km) |
| Mason City to Bootle | 3,923.52 mi (6,314.30 km) |
| Mason City to Borehamwood | 4,084.63 mi (6,573.58 km) |
| Mason City to Boscombe | 4,060.71 mi (6,535.08 km) |
| Mason City to Boston | 4,045.96 mi (6,511.34 km) |
| Mason City to Bottesford | 4,002.35 mi (6,441.16 km) |
| Mason City to Bourne | 4,040.65 mi (6,502.80 km) |
| Mason City to Bournemouth | 4,059.40 mi (6,532.97 km) |
| Mason City to Bournville | 3,996.54 mi (6,431.82 km) |
| Mason City to Bovingdon | 4,072.63 mi (6,554.27 km) |
| Mason City to Bowdon | 3,948.23 mi (6,354.06 km) |
| Mason City to Boxley | 4,127.40 mi (6,642.41 km) |
| Mason City to Brackley | 4,039.29 mi (6,500.61 km) |
| Mason City to Bracknell | 4,076.03 mi (6,559.74 km) |
