| Idar-Oberstein to Castle Rock (Colorado) | 5,031.55 mi (8,097.49 km) |
| Idar-Oberstein to Castro Valley (California) | 5,654.27 mi (9,099.67 km) |
| Idar-Oberstein to Catalina Foothills (Arizona) | 5,624.71 mi (9,052.09 km) |
| Idar-Oberstein to Cataño (Puerto Rico) | 4,520.28 mi (7,274.69 km) |
| Idar-Oberstein to Cathedral City (California) | 5,717.78 mi (9,201.88 km) |
| Idar-Oberstein to Catonsville (Maryland) | 3,985.40 mi (6,413.89 km) |
| Idar-Oberstein to Cave Spring (Virginia) | 4,211.44 mi (6,777.65 km) |
| Idar-Oberstein to Cayce (South Carolina) | 4,408.87 mi (7,095.39 km) |
| Idar-Oberstein to Cayey (Puerto Rico) | 4,537.45 mi (7,302.32 km) |
| Idar-Oberstein to Cedar City (Utah) | 5,391.89 mi (8,677.41 km) |
| Idar-Oberstein to Cedar Falls (Iowa) | 4,438.21 mi (7,142.61 km) |
| Idar-Oberstein to Cedar Hill (Texas) | 5,109.63 mi (8,223.16 km) |
| Idar-Oberstein to Cedar Lake (Indiana) | 4,308.54 mi (6,933.92 km) |
| Idar-Oberstein to Cedar Mill (Oregon) | 5,207.63 mi (8,380.88 km) |
| Idar-Oberstein to Cedar Park (Texas) | 5,251.45 mi (8,451.39 km) |
