| Idar-Oberstein to Rockville (Maryland) | 4,010.35 mi (6,454.03 km) |
| Idar-Oberstein to Rockville Centre (New York) | 3,797.12 mi (6,110.87 km) |
| Idar-Oberstein to Rockwall (Texas) | 5,072.25 mi (8,163.00 km) |
| Idar-Oberstein to Rocky Mount (North Carolina) | 4,179.48 mi (6,726.23 km) |
| Idar-Oberstein to Rocky Point (New York) | 3,756.72 mi (6,045.85 km) |
| Idar-Oberstein to Rocky River (Ohio) | 4,089.58 mi (6,581.55 km) |
| Idar-Oberstein to Roessleville (New York) | 3,716.68 mi (5,981.42 km) |
| Idar-Oberstein to Rogers (Arkansas) | 4,810.50 mi (7,741.74 km) |
| Idar-Oberstein to Rogers (Minnesota) | 4,348.31 mi (6,997.93 km) |
| Idar-Oberstein to Rohnert Park (California) | 5,633.45 mi (9,066.16 km) |
| Idar-Oberstein to Rolla (Missouri) | 4,638.25 mi (7,464.55 km) |
| Idar-Oberstein to Rolling Meadows (Illinois) | 4,297.12 mi (6,915.55 km) |
| Idar-Oberstein to Roma (Texas) | 5,515.44 mi (8,876.24 km) |
| Idar-Oberstein to Rome (Georgia) | 4,562.57 mi (7,342.75 km) |
| Idar-Oberstein to Rome (New York) | 3,761.98 mi (6,054.32 km) |
