| Idar-Oberstein to Castelli Calepio | 306.35 mi (493.02 km) |
| Idar-Oberstein to Castelnovo ne' Monti | 392.46 mi (631.60 km) |
| Idar-Oberstein to Castelnuovo Berardenga | 482.55 mi (776.59 km) |
| Idar-Oberstein to Castelnuovo di Porto | 579.57 mi (932.73 km) |
| Idar-Oberstein to Castelnuovo di Verona | 336.50 mi (541.54 km) |
| Idar-Oberstein to Castelnuovo Rangone | 395.02 mi (635.73 km) |
| Idar-Oberstein to Castelvetrano | 874.38 mi (1,407.18 km) |
| Idar-Oberstein to Castelvetro di Modena | 398.51 mi (641.34 km) |
| Idar-Oberstein to Castenaso | 408.98 mi (658.19 km) |
| Idar-Oberstein to Castenedolo | 324.27 mi (521.86 km) |
| Idar-Oberstein to Castiglion Fiorentino | 491.19 mi (790.49 km) |
| Idar-Oberstein to Castiglione del Lago | 506.79 mi (815.59 km) |
| Idar-Oberstein to Castiglione delle Stiviere | 332.82 mi (535.62 km) |
| Idar-Oberstein to Castrolibero | 839.81 mi (1,351.55 km) |
| Idar-Oberstein to Castrovillari | 809.56 mi (1,302.87 km) |
