| Iowa City to Opole | 4,776.22 mi (7,686.58 km) |
| Iowa City to Orzesze | 4,826.80 mi (7,767.99 km) |
| Iowa City to Osowa | 4,624.01 mi (7,441.62 km) |
| Iowa City to Ostroda | 4,702.75 mi (7,568.35 km) |
| Iowa City to Ostroleka | 4,781.01 mi (7,694.30 km) |
| Iowa City to Ostrow Mazowiecka | 4,803.72 mi (7,730.84 km) |
| Iowa City to Ostrow Wielkopolski | 4,727.94 mi (7,608.89 km) |
| Iowa City to Ostrowiec Swietokrzyski | 4,876.19 mi (7,847.47 km) |
| Iowa City to Ostrzeszow | 4,742.25 mi (7,631.91 km) |
| Iowa City to Oswiecim | 4,847.52 mi (7,801.33 km) |
| Iowa City to Otwock | 4,816.29 mi (7,751.06 km) |
| Iowa City to Ozarow Mazowiecki | 4,797.05 mi (7,720.10 km) |
| Iowa City to Ozimek | 4,785.15 mi (7,700.96 km) |
| Iowa City to Ozorkow | 4,760.74 mi (7,661.66 km) |
| Iowa City to Pabianice | 4,778.46 mi (7,690.19 km) |
