| Siena to Cognac | 596.97 mi (960.73 km) |
| Siena to Cogolin | 241.50 mi (388.66 km) |
| Siena to Colmar | 380.83 mi (612.89 km) |
| Siena to Colombes | 581.56 mi (935.93 km) |
| Siena to Colomiers | 501.31 mi (806.79 km) |
| Siena to Combs-la-Ville | 559.71 mi (900.77 km) |
| Siena to Comines | 645.72 mi (1,039.18 km) |
| Siena to Compiegne | 584.09 mi (940.01 km) |
| Siena to Concarneau | 799.93 mi (1,287.36 km) |
| Siena to Conde-sur-l'Escaut | 612.79 mi (986.18 km) |
| Siena to Conflans-Sainte-Honorine | 590.27 mi (949.96 km) |
| Siena to Corbas | 355.91 mi (572.78 km) |
| Siena to Corbeil-Essonnes | 560.15 mi (901.48 km) |
| Siena to Cormeilles-en-Parisis | 585.52 mi (942.31 km) |
| Siena to Cosne sur Loire | 496.01 mi (798.26 km) |
