| Iowa City to Noventa Vicentina | 4,788.16 mi (7,705.80 km) |
| Iowa City to Novi di Modena | 4,781.01 mi (7,694.29 km) |
| Iowa City to Novi Ligure | 4,705.21 mi (7,572.30 km) |
| Iowa City to Nuoro | 4,917.75 mi (7,914.36 km) |
| Iowa City to Occhiobello | 4,805.70 mi (7,734.02 km) |
| Iowa City to Oderzo | 4,802.51 mi (7,728.90 km) |
| Iowa City to Oggiono | 4,683.79 mi (7,537.83 km) |
| Iowa City to Olbia | 4,898.37 mi (7,883.16 km) |
| Iowa City to Oleggio | 4,664.01 mi (7,506.00 km) |
| Iowa City to Olgiate Comasco | 4,669.13 mi (7,514.25 km) |
| Iowa City to Olgiate Olona | 4,672.23 mi (7,519.22 km) |
| Iowa City to Omegna | 4,643.71 mi (7,473.33 km) |
| Iowa City to Opera | 4,695.55 mi (7,556.76 km) |
| Iowa City to Oppeano | 4,774.18 mi (7,683.30 km) |
| Iowa City to Orbassano | 4,646.17 mi (7,477.28 km) |
