| Idar-Oberstein to Cologno al Serio | 306.06 mi (492.55 km) |
| Idar-Oberstein to Cologno Monzese | 303.12 mi (487.83 km) |
| Idar-Oberstein to Colorno | 360.01 mi (579.39 km) |
| Idar-Oberstein to Comacchio | 414.71 mi (667.41 km) |
| Idar-Oberstein to Comiso | 953.65 mi (1,534.75 km) |
| Idar-Oberstein to Como | 281.82 mi (453.54 km) |
| Idar-Oberstein to Concordia Sagittaria | 374.60 mi (602.86 km) |
| Idar-Oberstein to Concorezzo | 299.91 mi (482.66 km) |
| Idar-Oberstein to Conegliano | 351.05 mi (564.96 km) |
| Idar-Oberstein to Conselice | 416.95 mi (671.01 km) |
| Idar-Oberstein to Conselve | 375.29 mi (603.97 km) |
| Idar-Oberstein to Conversano | 767.91 mi (1,235.82 km) |
| Idar-Oberstein to Copertino | 835.59 mi (1,344.76 km) |
| Idar-Oberstein to Copparo | 393.99 mi (634.07 km) |
| Idar-Oberstein to Corato | 736.45 mi (1,185.20 km) |
