| Iowa City to Bonhill | 3,802.64 mi (6,119.76 km) |
| Iowa City to Bonnyrigg | 3,857.17 mi (6,207.52 km) |
| Iowa City to Bootle | 3,935.47 mi (6,333.53 km) |
| Iowa City to Borehamwood | 4,094.55 mi (6,589.53 km) |
| Iowa City to Boscombe | 4,067.08 mi (6,545.33 km) |
| Iowa City to Boston | 4,059.16 mi (6,532.59 km) |
| Iowa City to Bottesford | 4,016.40 mi (6,463.76 km) |
| Iowa City to Bourne | 4,053.08 mi (6,522.80 km) |
| Iowa City to Bournemouth | 4,065.72 mi (6,543.15 km) |
| Iowa City to Bournville | 4,006.88 mi (6,448.45 km) |
| Iowa City to Bovingdon | 4,082.47 mi (6,570.10 km) |
| Iowa City to Bowdon | 3,960.50 mi (6,373.80 km) |
| Iowa City to Boxley | 4,137.20 mi (6,658.18 km) |
| Iowa City to Brackley | 4,049.33 mi (6,516.77 km) |
| Iowa City to Bracknell | 4,084.97 mi (6,574.13 km) |
