| Boulogne-sur-Mer to Carquefou | 275.59 mi (443.51 km) |
| Boulogne-sur-Mer to Carqueiranne | 567.46 mi (913.24 km) |
| Boulogne-sur-Mer to Carrieres-sous-Poissy | 124.33 mi (200.09 km) |
| Boulogne-sur-Mer to Carrieres-sur-Seine | 128.99 mi (207.60 km) |
| Boulogne-sur-Mer to Carros | 546.72 mi (879.85 km) |
| Boulogne-sur-Mer to Carvin | 61.07 mi (98.28 km) |
| Boulogne-sur-Mer to Castanet-Tolosan | 498.25 mi (801.85 km) |
| Boulogne-sur-Mer to Castelginest | 485.99 mi (782.13 km) |
| Boulogne-sur-Mer to Castelnau-le-Lez | 501.41 mi (806.94 km) |
| Boulogne-sur-Mer to Castelnaudary | 512.11 mi (824.16 km) |
| Boulogne-sur-Mer to Castelsarrasin | 462.59 mi (744.47 km) |
| Boulogne-sur-Mer to Castres | 493.28 mi (793.87 km) |
| Boulogne-sur-Mer to Caudebec-les-Elbeuf | 103.30 mi (166.25 km) |
| Boulogne-sur-Mer to Caudry | 89.35 mi (143.79 km) |
| Boulogne-sur-Mer to Cavaillon | 502.15 mi (808.14 km) |
