| Iowa City to Oakley (California) | 1,612.13 mi (2,594.47 km) |
| Iowa City to Oakton (Virginia) | 773.07 mi (1,244.14 km) |
| Iowa City to Oakville (Missouri) | 230.70 mi (371.28 km) |
| Iowa City to Oatfield (Oregon) | 1,567.42 mi (2,522.52 km) |
| Iowa City to Ocala (Florida) | 1,009.56 mi (1,624.73 km) |
| Iowa City to Ocean Acres (New Jersey) | 911.63 mi (1,467.12 km) |
| Iowa City to Ocean City (New Jersey) | 903.51 mi (1,454.07 km) |
| Iowa City to Ocean Pines (Maryland) | 894.23 mi (1,439.12 km) |
| Iowa City to Ocean Pointe (Hawaii) | 4,057.46 mi (6,529.85 km) |
| Iowa City to Ocean Springs (Mississippi) | 792.00 mi (1,274.60 km) |
| Iowa City to Oceanside (California) | 1,522.05 mi (2,449.50 km) |
| Iowa City to Oceanside (New York) | 932.04 mi (1,499.97 km) |
| Iowa City to Ocoee (Florida) | 1,063.86 mi (1,712.11 km) |
| Iowa City to Oconomowoc (Wisconsin) | 184.25 mi (296.52 km) |
| Iowa City to Odenton (Maryland) | 800.24 mi (1,287.86 km) |
