| Idar-Oberstein to Cognac | 450.45 mi (724.94 km) |
| Idar-Oberstein to Cogolin | 447.81 mi (720.68 km) |
| Idar-Oberstein to Colmar | 112.62 mi (181.24 km) |
| Idar-Oberstein to Colombes | 234.30 mi (377.07 km) |
| Idar-Oberstein to Colomiers | 507.38 mi (816.54 km) |
| Idar-Oberstein to Combs-la-Ville | 226.32 mi (364.23 km) |
| Idar-Oberstein to Comines | 203.58 mi (327.64 km) |
| Idar-Oberstein to Compiegne | 202.23 mi (325.45 km) |
| Idar-Oberstein to Concarneau | 526.20 mi (846.83 km) |
| Idar-Oberstein to Conde-sur-l'Escaut | 172.72 mi (277.97 km) |
| Idar-Oberstein to Conflans-Sainte-Honorine | 239.74 mi (385.83 km) |
| Idar-Oberstein to Corbas | 300.99 mi (484.40 km) |
| Idar-Oberstein to Corbeil-Essonnes | 231.02 mi (371.79 km) |
| Idar-Oberstein to Cormeilles-en-Parisis | 235.64 mi (379.22 km) |
| Idar-Oberstein to Cosne sur Loire | 255.94 mi (411.89 km) |
