| Boulogne-sur-Mer to Cartagena | 915.88 mi (1,473.97 km) |
| Boulogne-sur-Mer to Cartama | 1,016.41 mi (1,635.75 km) |
| Boulogne-sur-Mer to Cartaya | 1,024.19 mi (1,648.27 km) |
| Boulogne-sur-Mer to Caspe | 660.62 mi (1,063.16 km) |
| Boulogne-sur-Mer to Cassa de la Selva | 613.51 mi (987.35 km) |
| Boulogne-sur-Mer to Castalla | 845.46 mi (1,360.64 km) |
| Boulogne-sur-Mer to Castellbisbal | 639.33 mi (1,028.91 km) |
| Boulogne-sur-Mer to Castelldefels | 652.91 mi (1,050.76 km) |
| Boulogne-sur-Mer to Castello de Ampurias | 589.17 mi (948.18 km) |
| Boulogne-sur-Mer to Castellon de la Plana | 746.54 mi (1,201.44 km) |
| Boulogne-sur-Mer to Castilleja de la Cuesta | 996.08 mi (1,603.04 km) |
| Boulogne-sur-Mer to Catarroja | 788.48 mi (1,268.94 km) |
| Boulogne-sur-Mer to Catral | 876.33 mi (1,410.32 km) |
| Boulogne-sur-Mer to Caudete | 840.27 mi (1,352.29 km) |
| Boulogne-sur-Mer to Cehegin | 888.78 mi (1,430.35 km) |
