| Boulogne-sur-Mer to Busto Garolfo | 489.91 mi (788.43 km) |
| Boulogne-sur-Mer to Cabras | 817.08 mi (1,314.97 km) |
| Boulogne-sur-Mer to Cadelbosco di Sopra | 585.58 mi (942.39 km) |
| Boulogne-sur-Mer to Cadoneghe | 598.84 mi (963.74 km) |
| Boulogne-sur-Mer to Cagli | 716.13 mi (1,152.49 km) |
| Boulogne-sur-Mer to Cagliari | 873.81 mi (1,406.25 km) |
| Boulogne-sur-Mer to Cairo Montenotte | 535.48 mi (861.78 km) |
| Boulogne-sur-Mer to Caivano | 908.06 mi (1,461.38 km) |
| Boulogne-sur-Mer to Calcinaia | 643.55 mi (1,035.69 km) |
| Boulogne-sur-Mer to Calcinato | 544.70 mi (876.61 km) |
| Boulogne-sur-Mer to Calderara di Reno | 617.92 mi (994.45 km) |
| Boulogne-sur-Mer to Caldogno | 576.05 mi (927.06 km) |
| Boulogne-sur-Mer to Calenzano | 650.88 mi (1,047.50 km) |
| Boulogne-sur-Mer to Calolziocorte | 494.67 mi (796.09 km) |
| Boulogne-sur-Mer to Caltagirone | 1,127.71 mi (1,814.87 km) |
