| Idar-Oberstein to Cosenza | 842.10 mi (1,355.22 km) |
| Idar-Oberstein to Cossato | 289.11 mi (465.28 km) |
| Idar-Oberstein to Costa Volpino | 297.67 mi (479.05 km) |
| Idar-Oberstein to Creazzo | 347.80 mi (559.73 km) |
| Idar-Oberstein to Crema | 319.86 mi (514.76 km) |
| Idar-Oberstein to Cremona | 340.86 mi (548.56 km) |
| Idar-Oberstein to Crevalcore | 389.13 mi (626.24 km) |
| Idar-Oberstein to Crispiano | 792.25 mi (1,275.00 km) |
| Idar-Oberstein to Crosia | 839.56 mi (1,351.13 km) |
| Idar-Oberstein to Crotone | 877.83 mi (1,412.73 km) |
| Idar-Oberstein to Cuneo | 368.30 mi (592.73 km) |
| Idar-Oberstein to Cuorgne | 299.01 mi (481.21 km) |
| Idar-Oberstein to Cusano Milanino | 300.40 mi (483.44 km) |
| Idar-Oberstein to Cutro | 877.28 mi (1,411.84 km) |
| Idar-Oberstein to Cutrofiano | 848.63 mi (1,365.73 km) |
