| Iowa City to Cascais | 4,165.78 mi (6,704.18 km) |
| Iowa City to Castelo Branco | 4,212.53 mi (6,779.42 km) |
| Iowa City to Castro Daire | 4,154.02 mi (6,685.25 km) |
| Iowa City to Celorico de Basto | 4,133.86 mi (6,652.81 km) |
| Iowa City to Chamusca | 4,184.94 mi (6,735.00 km) |
| Iowa City to Chaves | 4,144.66 mi (6,670.19 km) |
| Iowa City to Cinfaes | 4,137.96 mi (6,659.40 km) |
| Iowa City to Coimbra | 4,156.37 mi (6,689.03 km) |
| Iowa City to Condeixa-a-Nova | 4,156.56 mi (6,689.33 km) |
| Iowa City to Corroios | 4,181.09 mi (6,728.81 km) |
| Iowa City to Coruche | 4,197.22 mi (6,754.78 km) |
| Iowa City to Costa de Caparica | 4,176.11 mi (6,720.80 km) |
| Iowa City to Covilha | 4,195.60 mi (6,752.16 km) |
| Iowa City to Eiras | 4,155.49 mi (6,687.62 km) |
| Iowa City to Elvas | 4,263.25 mi (6,861.04 km) |
