| Mason City to Bilecik | 5,679.57 mi (9,140.38 km) |
| Mason City to Bingol | 6,072.02 mi (9,771.97 km) |
| Mason City to Birecik | 6,106.26 mi (9,827.07 km) |
| Mason City to Bitlis | 6,145.83 mi (9,890.75 km) |
| Mason City to Bodrum | 5,761.04 mi (9,271.50 km) |
| Mason City to Bogazliyan | 5,898.94 mi (9,493.43 km) |
| Mason City to Bolu | 5,699.45 mi (9,172.37 km) |
| Mason City to Bolvadin | 5,792.49 mi (9,322.11 km) |
| Mason City to Bor | 5,951.83 mi (9,578.55 km) |
| Mason City to Borcka | 5,958.64 mi (9,589.51 km) |
| Mason City to Boyabat | 5,756.23 mi (9,263.75 km) |
| Mason City to Bozdogan | 5,757.56 mi (9,265.89 km) |
| Mason City to Bozkir | 5,916.02 mi (9,520.91 km) |
| Mason City to Bozkurt | 5,794.13 mi (9,324.75 km) |
| Mason City to Bozuyuk | 5,694.25 mi (9,164.01 km) |
