| Mason City to Bougival | 4,279.51 mi (6,887.21 km) |
| Mason City to Bouguenais | 4,200.45 mi (6,759.98 km) |
| Mason City to Boulogne-Billancourt | 4,284.48 mi (6,895.21 km) |
| Mason City to Boulogne-sur-Mer | 4,188.15 mi (6,740.18 km) |
| Mason City to Bourg-de-Peage | 4,546.31 mi (7,316.58 km) |
| Mason City to Bourg-en-Bresse | 4,504.05 mi (7,248.56 km) |
| Mason City to Bourg-la-Reine | 4,289.44 mi (6,903.19 km) |
| Mason City to Bourg-les-Valence | 4,544.13 mi (7,313.08 km) |
| Mason City to Bourges | 4,359.89 mi (7,016.57 km) |
| Mason City to Bourgoin-Jallieu | 4,531.79 mi (7,293.21 km) |
| Mason City to Bressuire | 4,257.79 mi (6,852.26 km) |
| Mason City to Brest | 4,043.13 mi (6,506.80 km) |
| Mason City to Bretigny-sur-Orge | 4,295.72 mi (6,913.30 km) |
| Mason City to Breuillet | 4,292.46 mi (6,908.05 km) |
| Mason City to Briancon | 4,613.34 mi (7,424.45 km) |
