| Iowa City to Ratingen | 4,367.78 mi (7,029.26 km) |
| Iowa City to Ratzeburg | 4,407.80 mi (7,093.67 km) |
| Iowa City to Raubling | 4,701.15 mi (7,565.77 km) |
| Iowa City to Rauenberg | 4,515.41 mi (7,266.86 km) |
| Iowa City to Raunheim | 4,475.95 mi (7,203.34 km) |
| Iowa City to Ravensburg | 4,609.86 mi (7,418.85 km) |
| Iowa City to Recke | 4,356.98 mi (7,011.89 km) |
| Iowa City to Recklinghausen | 4,367.85 mi (7,029.37 km) |
| Iowa City to Regen | 4,687.26 mi (7,543.42 km) |
| Iowa City to Regensburg | 4,647.80 mi (7,479.91 km) |
| Iowa City to Regenstauf | 4,644.85 mi (7,475.16 km) |
| Iowa City to Rehau | 4,593.17 mi (7,392.00 km) |
| Iowa City to Rehburg-Loccum | 4,405.45 mi (7,089.88 km) |
| Iowa City to Rehlingen-Siersburg | 4,437.04 mi (7,140.72 km) |
| Iowa City to Reichelsheim | 4,502.21 mi (7,245.61 km) |
