| Siena to Carpentras | 317.92 mi (511.64 km) |
| Siena to Carquefou | 680.04 mi (1,094.42 km) |
| Siena to Carqueiranne | 265.19 mi (426.79 km) |
| Siena to Carrieres-sous-Poissy | 590.22 mi (949.87 km) |
| Siena to Carrieres-sur-Seine | 579.70 mi (932.94 km) |
| Siena to Carros | 209.58 mi (337.28 km) |
| Siena to Carvin | 633.19 mi (1,019.02 km) |
| Siena to Castanet-Tolosan | 493.41 mi (794.06 km) |
| Siena to Castelginest | 496.44 mi (798.94 km) |
| Siena to Castelnau-le-Lez | 373.02 mi (600.31 km) |
| Siena to Castelnaudary | 471.15 mi (758.24 km) |
| Siena to Castelsarrasin | 513.01 mi (825.60 km) |
| Siena to Castres | 455.64 mi (733.29 km) |
| Siena to Caudebec-les-Elbeuf | 640.84 mi (1,031.33 km) |
| Siena to Caudry | 600.88 mi (967.02 km) |
