| Iowa City to Bilecik | 5,702.31 mi (9,176.98 km) |
| Iowa City to Bingol | 6,108.09 mi (9,830.02 km) |
| Iowa City to Birecik | 6,136.25 mi (9,875.34 km) |
| Iowa City to Bitlis | 6,183.69 mi (9,951.69 km) |
| Iowa City to Bodrum | 5,775.59 mi (9,294.92 km) |
| Iowa City to Bogazliyan | 5,927.77 mi (9,539.82 km) |
| Iowa City to Bolu | 5,725.29 mi (9,213.96 km) |
| Iowa City to Bolvadin | 5,814.67 mi (9,357.80 km) |
| Iowa City to Bor | 5,977.90 mi (9,620.51 km) |
| Iowa City to Borcka | 5,999.39 mi (9,655.09 km) |
| Iowa City to Boyabat | 5,787.44 mi (9,313.99 km) |
| Iowa City to Bozdogan | 5,774.32 mi (9,292.87 km) |
| Iowa City to Bozkir | 5,937.74 mi (9,555.87 km) |
| Iowa City to Bozkurt | 5,812.96 mi (9,355.05 km) |
| Iowa City to Bozuyuk | 5,716.73 mi (9,200.18 km) |
