| Boulogne-sur-Mer to Cabries | 533.44 mi (858.49 km) |
| Boulogne-sur-Mer to Cachan | 137.44 mi (221.19 km) |
| Boulogne-sur-Mer to Caen | 138.56 mi (222.98 km) |
| Boulogne-sur-Mer to Cagnes-sur-Mer | 552.43 mi (889.05 km) |
| Boulogne-sur-Mer to Cahors | 433.91 mi (698.30 km) |
| Boulogne-sur-Mer to Calais | 18.60 mi (29.93 km) |
| Boulogne-sur-Mer to Caluire-et-Cuire | 371.65 mi (598.11 km) |
| Boulogne-sur-Mer to Cambrai | 80.79 mi (130.02 km) |
| Boulogne-sur-Mer to Canet-en-Roussillon | 558.07 mi (898.12 km) |
| Boulogne-sur-Mer to Cannes | 556.54 mi (895.66 km) |
| Boulogne-sur-Mer to Canteleu | 91.77 mi (147.69 km) |
| Boulogne-sur-Mer to Capbreton | 509.86 mi (820.53 km) |
| Boulogne-sur-Mer to Carcassonne | 520.48 mi (837.63 km) |
| Boulogne-sur-Mer to Carmaux | 462.05 mi (743.59 km) |
| Boulogne-sur-Mer to Carpentras | 487.95 mi (785.27 km) |
