| Idstein to Coudekerque-Branche | 263.70 mi (424.39 km) |
| Idstein to Coueron | 500.25 mi (805.08 km) |
| Idstein to Coulommiers | 252.19 mi (405.85 km) |
| Idstein to Courbevoic | 284.81 mi (458.37 km) |
| Idstein to Courcouronnes | 284.81 mi (458.36 km) |
| Idstein to Cournon-d'Auvergne | 388.24 mi (624.81 km) |
| Idstein to Courrieres | 235.43 mi (378.89 km) |
| Idstein to Coutras | 529.67 mi (852.41 km) |
| Idstein to Couzeix | 442.04 mi (711.39 km) |
| Idstein to Cran-Gevrier | 314.63 mi (506.34 km) |
| Idstein to Craponne | 350.02 mi (563.30 km) |
| Idstein to Creil | 266.91 mi (429.55 km) |
| Idstein to Crepy-en-Valois | 249.99 mi (402.32 km) |
| Idstein to Crest | 408.64 mi (657.64 km) |
| Idstein to Creteil | 278.73 mi (448.57 km) |
