| Idar-Oberstein to Ridgeland (Mississippi) | 4,852.98 mi (7,810.11 km) |
| Idar-Oberstein to Ridgewood (New Jersey) | 3,802.73 mi (6,119.90 km) |
| Idar-Oberstein to Rifle (Colorado) | 5,119.10 mi (8,238.40 km) |
| Idar-Oberstein to Rincon (Georgia) | 4,496.43 mi (7,236.30 km) |
| Idar-Oberstein to Ringwood (New Jersey) | 3,803.95 mi (6,121.86 km) |
| Idar-Oberstein to Río Grande (Puerto Rico) | 4,509.61 mi (7,257.51 km) |
| Idar-Oberstein to Rio Grande City (Texas) | 5,510.15 mi (8,867.73 km) |
| Idar-Oberstein to Rio Linda (California) | 5,578.90 mi (8,978.37 km) |
| Idar-Oberstein to Rio Rancho (New Mexico) | 5,316.46 mi (8,556.01 km) |
| Idar-Oberstein to Rio Rico (Arizona) | 5,673.95 mi (9,131.33 km) |
| Idar-Oberstein to Ripon (California) | 5,626.42 mi (9,054.85 km) |
| Idar-Oberstein to River Edge (New Jersey) | 3,802.10 mi (6,118.89 km) |
| Idar-Oberstein to River Falls (Wisconsin) | 4,330.74 mi (6,969.65 km) |
| Idar-Oberstein to River Forest (Illinois) | 4,297.94 mi (6,916.87 km) |
| Idar-Oberstein to River Grove (Illinois) | 4,297.25 mi (6,915.75 km) |
