| Iowa City to Ayamonte | 4,314.03 mi (6,942.76 km) |
| Iowa City to Azcoitia | 4,316.17 mi (6,946.21 km) |
| Iowa City to Azpeitia | 4,318.00 mi (6,949.14 km) |
| Iowa City to Azuqueca de Henares | 4,373.06 mi (7,037.76 km) |
| Iowa City to Badajoz | 4,270.68 mi (6,873.00 km) |
| Iowa City to Badalona | 4,576.05 mi (7,364.44 km) |
| Iowa City to Baena | 4,439.18 mi (7,144.17 km) |
| Iowa City to Baeza | 4,463.37 mi (7,183.09 km) |
| Iowa City to Bailen | 4,445.98 mi (7,155.11 km) |
| Iowa City to Balaguer | 4,501.50 mi (7,244.47 km) |
| Iowa City to Banolas | 4,570.93 mi (7,356.21 km) |
| Iowa City to Baranain | 4,357.72 mi (7,013.08 km) |
| Iowa City to Barbadanes | 4,105.74 mi (6,607.55 km) |
| Iowa City to Barbastro | 4,463.10 mi (7,182.67 km) |
| Iowa City to Barcelona | 4,575.71 mi (7,363.89 km) |
