| Idstein to Cologno al Serio | 327.12 mi (526.46 km) |
| Idstein to Cologno Monzese | 327.50 mi (527.06 km) |
| Idstein to Colorno | 378.27 mi (608.77 km) |
| Idstein to Comacchio | 422.75 mi (680.35 km) |
| Idstein to Comiso | 969.14 mi (1,559.68 km) |
| Idstein to Como | 307.02 mi (494.10 km) |
| Idstein to Concordia Sagittaria | 373.29 mi (600.75 km) |
| Idstein to Concorezzo | 323.71 mi (520.96 km) |
| Idstein to Conegliano | 352.28 mi (566.94 km) |
| Idstein to Conselice | 427.72 mi (688.35 km) |
| Idstein to Conselve | 382.80 mi (616.05 km) |
| Idstein to Conversano | 767.95 mi (1,235.90 km) |
| Idstein to Copertino | 834.62 mi (1,343.18 km) |
| Idstein to Copparo | 403.22 mi (648.92 km) |
| Idstein to Corato | 738.34 mi (1,188.24 km) |
