| Idar-Oberstein to Chitila | 945.46 mi (1,521.57 km) |
| Idar-Oberstein to Cisnadie | 827.95 mi (1,332.46 km) |
| Idar-Oberstein to Cluj-Napoca | 774.14 mi (1,245.85 km) |
| Idar-Oberstein to Codlea | 884.89 mi (1,424.10 km) |
| Idar-Oberstein to Comanesti | 909.40 mi (1,463.54 km) |
| Idar-Oberstein to Comarnic | 906.57 mi (1,458.99 km) |
| Idar-Oberstein to Constanta | 1,071.74 mi (1,724.79 km) |
| Idar-Oberstein to Corabia | 908.59 mi (1,462.24 km) |
| Idar-Oberstein to Costesti | 892.65 mi (1,436.59 km) |
| Idar-Oberstein to Covasna | 913.13 mi (1,469.54 km) |
| Idar-Oberstein to Craiova | 859.15 mi (1,382.66 km) |
| Idar-Oberstein to Cristuru Secuiesc | 850.42 mi (1,368.61 km) |
| Idar-Oberstein to Cugir | 789.83 mi (1,271.12 km) |
| Idar-Oberstein to Cumpana | 1,070.14 mi (1,722.23 km) |
| Idar-Oberstein to Curtea de Arges | 868.59 mi (1,397.86 km) |
