| Siena to Castrovillari | 348.99 mi (561.64 km) |
| Siena to Catania | 447.89 mi (720.81 km) |
| Siena to Catanzaro | 410.21 mi (660.18 km) |
| Siena to Cattolica | 83.19 mi (133.88 km) |
| Siena to Cava de' Tirreni | 250.23 mi (402.70 km) |
| Siena to Cavallino | 409.81 mi (659.52 km) |
| Siena to Cavarzere | 131.03 mi (210.88 km) |
| Siena to Cave | 131.94 mi (212.33 km) |
| Siena to Cavriago | 103.38 mi (166.37 km) |
| Siena to Cavriglia | 15.69 mi (25.24 km) |
| Siena to Cazzago San Martino | 169.12 mi (272.17 km) |
| Siena to Ceccano | 158.31 mi (254.78 km) |
| Siena to Cecina | 40.95 mi (65.91 km) |
| Siena to Cefalu | 391.27 mi (629.69 km) |
| Siena to Ceglie Messapico | 366.41 mi (589.68 km) |
