| Iowa City to Ridgeland (Mississippi) | 642.40 mi (1,033.85 km) |
| Iowa City to Ridgewood (New Jersey) | 903.50 mi (1,454.04 km) |
| Iowa City to Rifle (Colorado) | 863.29 mi (1,389.33 km) |
| Iowa City to Rincon (Georgia) | 859.66 mi (1,383.49 km) |
| Iowa City to Ringwood (New Jersey) | 893.88 mi (1,438.55 km) |
| Iowa City to Río Grande (Puerto Rico) | 2,207.53 mi (3,552.68 km) |
| Iowa City to Rio Grande City (Texas) | 1,133.89 mi (1,824.82 km) |
| Iowa City to Rio Linda (California) | 1,584.38 mi (2,549.81 km) |
| Iowa City to Rio Rancho (New Mexico) | 929.14 mi (1,495.31 km) |
| Iowa City to Rio Rico (Arizona) | 1,283.11 mi (2,064.97 km) |
| Iowa City to Ripon (California) | 1,588.61 mi (2,556.62 km) |
| Iowa City to River Edge (New Jersey) | 907.90 mi (1,461.12 km) |
| Iowa City to River Falls (Wisconsin) | 228.18 mi (367.22 km) |
| Iowa City to River Forest (Illinois) | 191.91 mi (308.85 km) |
| Iowa City to River Grove (Illinois) | 191.10 mi (307.55 km) |
