| Idar-Oberstein to Corbetta | 302.63 mi (487.04 km) |
| Idar-Oberstein to Corciano | 512.18 mi (824.27 km) |
| Idar-Oberstein to Cordenons | 358.63 mi (577.16 km) |
| Idar-Oberstein to Cori | 619.03 mi (996.24 km) |
| Idar-Oberstein to Coriano | 468.75 mi (754.39 km) |
| Idar-Oberstein to Corigliano Calabro | 830.90 mi (1,337.20 km) |
| Idar-Oberstein to Corleone | 873.74 mi (1,406.15 km) |
| Idar-Oberstein to Cormano | 300.17 mi (483.08 km) |
| Idar-Oberstein to Cornaredo | 301.79 mi (485.68 km) |
| Idar-Oberstein to Cornate d'Adda | 297.93 mi (479.47 km) |
| Idar-Oberstein to Cornedo Vicentino | 339.49 mi (546.35 km) |
| Idar-Oberstein to Correggio | 378.09 mi (608.48 km) |
| Idar-Oberstein to Corridonia | 534.77 mi (860.63 km) |
| Idar-Oberstein to Corsico | 307.29 mi (494.53 km) |
| Idar-Oberstein to Cortona | 496.93 mi (799.74 km) |
