| Idar-Oberstein to Castelfiorentino | 456.28 mi (734.32 km) |
| Idar-Oberstein to Castelfranco di Sopra | 466.12 mi (750.14 km) |
| Idar-Oberstein to Castelfranco di Sotto | 446.00 mi (717.78 km) |
| Idar-Oberstein to Castelfranco Emilia | 394.54 mi (634.95 km) |
| Idar-Oberstein to Castelfranco Veneto | 352.38 mi (567.10 km) |
| Idar-Oberstein to Castellabate | 750.14 mi (1,207.24 km) |
| Idar-Oberstein to Castellammare del Golfo | 853.05 mi (1,372.85 km) |
| Idar-Oberstein to Castellammare di Stabia | 713.28 mi (1,147.91 km) |
| Idar-Oberstein to Castellamonte | 299.71 mi (482.34 km) |
| Idar-Oberstein to Castellana Grotte | 774.13 mi (1,245.84 km) |
| Idar-Oberstein to Castellaneta | 781.59 mi (1,257.85 km) |
| Idar-Oberstein to Castellanza | 292.38 mi (470.53 km) |
| Idar-Oberstein to Castellarano | 390.99 mi (629.23 km) |
| Idar-Oberstein to Castelleone | 325.73 mi (524.22 km) |
| Idar-Oberstein to Castelletto sopra Ticino | 282.74 mi (455.02 km) |
