| Boulogne-sur-Mer to Cosenza | 1,061.19 mi (1,707.83 km) |
| Boulogne-sur-Mer to Cossato | 466.89 mi (751.38 km) |
| Boulogne-sur-Mer to Costa Volpino | 515.79 mi (830.08 km) |
| Boulogne-sur-Mer to Creazzo | 578.71 mi (931.34 km) |
| Boulogne-sur-Mer to Crema | 524.82 mi (844.61 km) |
| Boulogne-sur-Mer to Cremona | 548.20 mi (882.24 km) |
| Boulogne-sur-Mer to Crevalcore | 606.44 mi (975.98 km) |
| Boulogne-sur-Mer to Crispiano | 1,024.88 mi (1,649.39 km) |
| Boulogne-sur-Mer to Crosia | 1,063.57 mi (1,711.64 km) |
| Boulogne-sur-Mer to Crotone | 1,101.37 mi (1,772.49 km) |
| Boulogne-sur-Mer to Cuneo | 517.96 mi (833.57 km) |
| Boulogne-sur-Mer to Cuorgne | 461.88 mi (743.32 km) |
| Boulogne-sur-Mer to Cusano Milanino | 499.21 mi (803.40 km) |
| Boulogne-sur-Mer to Cutro | 1,099.71 mi (1,769.81 km) |
| Boulogne-sur-Mer to Cutrofiano | 1,083.71 mi (1,744.06 km) |
