| Mason City to Beyne-Heusay | 4,337.82 mi (6,981.04 km) |
| Mason City to Bierbeek | 4,297.68 mi (6,916.45 km) |
| Mason City to Bilzen | 4,323.00 mi (6,957.19 km) |
| Mason City to Binche | 4,293.41 mi (6,909.58 km) |
| Mason City to Bissegem | 4,242.77 mi (6,828.09 km) |
| Mason City to Blankenberge | 4,220.41 mi (6,792.10 km) |
| Mason City to Blegny | 4,338.75 mi (6,982.55 km) |
| Mason City to Bocholt | 4,312.92 mi (6,940.97 km) |
| Mason City to Boechout | 4,275.02 mi (6,879.98 km) |
| Mason City to Bonheiden | 4,281.42 mi (6,890.28 km) |
| Mason City to Boom | 4,273.51 mi (6,877.55 km) |
| Mason City to Boortmeerbeek | 4,284.59 mi (6,895.38 km) |
| Mason City to Borgerhout | 4,271.07 mi (6,873.62 km) |
| Mason City to Borgloon | 4,319.44 mi (6,951.47 km) |
| Mason City to Bornem | 4,268.10 mi (6,868.84 km) |
