| Boulogne-sur-Mer to Cologno al Serio | 514.39 mi (827.83 km) |
| Boulogne-sur-Mer to Cologno Monzese | 503.37 mi (810.09 km) |
| Boulogne-sur-Mer to Colorno | 569.92 mi (917.19 km) |
| Boulogne-sur-Mer to Comacchio | 642.94 mi (1,034.71 km) |
| Boulogne-sur-Mer to Comiso | 1,147.32 mi (1,846.43 km) |
| Boulogne-sur-Mer to Como | 482.71 mi (776.85 km) |
| Boulogne-sur-Mer to Concordia Sagittaria | 619.19 mi (996.49 km) |
| Boulogne-sur-Mer to Concorezzo | 502.10 mi (808.05 km) |
| Boulogne-sur-Mer to Conegliano | 593.10 mi (954.50 km) |
| Boulogne-sur-Mer to Conselice | 639.69 mi (1,029.48 km) |
| Boulogne-sur-Mer to Conselve | 606.41 mi (975.93 km) |
| Boulogne-sur-Mer to Conversano | 1,002.00 mi (1,612.56 km) |
| Boulogne-sur-Mer to Copertino | 1,070.71 mi (1,723.14 km) |
| Boulogne-sur-Mer to Copparo | 621.00 mi (999.40 km) |
| Boulogne-sur-Mer to Corato | 967.53 mi (1,557.09 km) |
