| Siena to Coudekerque-Branche | 677.11 mi (1,089.71 km) |
| Siena to Coueron | 688.46 mi (1,107.96 km) |
| Siena to Coulommiers | 547.68 mi (881.40 km) |
| Siena to Courbevoic | 580.42 mi (934.10 km) |
| Siena to Courcouronnes | 562.48 mi (905.23 km) |
| Siena to Cournon-d'Auvergne | 433.99 mi (698.43 km) |
| Siena to Courrieres | 631.70 mi (1,016.63 km) |
| Siena to Coutras | 579.67 mi (932.90 km) |
| Siena to Couzeix | 526.61 mi (847.50 km) |
| Siena to Cran-Gevrier | 312.98 mi (503.69 km) |
| Siena to Craponne | 365.97 mi (588.97 km) |
| Siena to Creil | 588.25 mi (946.70 km) |
| Siena to Crepy-en-Valois | 573.52 mi (922.99 km) |
| Siena to Crest | 328.14 mi (528.09 km) |
| Siena to Creteil | 568.37 mi (914.70 km) |
