| Iowa City to Olivares | 4,363.30 mi (7,022.05 km) |
| Iowa City to Olivenza | 4,272.19 mi (6,875.43 km) |
| Iowa City to Olot | 4,556.84 mi (7,333.52 km) |
| Iowa City to Onate | 4,317.10 mi (6,947.70 km) |
| Iowa City to Onda | 4,527.57 mi (7,286.42 km) |
| Iowa City to Onteniente | 4,557.72 mi (7,334.95 km) |
| Iowa City to Orihuela | 4,572.02 mi (7,357.96 km) |
| Iowa City to Osuna | 4,418.34 mi (7,110.63 km) |
| Iowa City to Ourense | 4,106.38 mi (6,608.57 km) |
| Iowa City to Oviedo | 4,158.35 mi (6,692.22 km) |
| Iowa City to Paiporta | 4,541.98 mi (7,309.62 km) |
| Iowa City to Pajara | 4,331.86 mi (6,971.46 km) |
| Iowa City to Palafolls | 4,588.35 mi (7,384.24 km) |
| Iowa City to Palafrugell | 4,595.62 mi (7,395.93 km) |
| Iowa City to Palamos | 4,597.08 mi (7,398.28 km) |
