| Boulogne-sur-Mer to Cankova | 711.00 mi (1,144.24 km) |
| Boulogne-sur-Mer to Celje | 696.60 mi (1,121.07 km) |
| Boulogne-sur-Mer to Cerklje na Gorenjskem | 664.40 mi (1,069.26 km) |
| Boulogne-sur-Mer to Cerknica | 676.62 mi (1,088.92 km) |
| Boulogne-sur-Mer to Cerkno | 649.16 mi (1,044.71 km) |
| Boulogne-sur-Mer to Cerkvenjak | 712.94 mi (1,147.37 km) |
| Boulogne-sur-Mer to Cirkulane | 722.63 mi (1,162.96 km) |
| Boulogne-sur-Mer to Crensovci | 727.26 mi (1,170.41 km) |
| Boulogne-sur-Mer to Crna na Koroskem | 671.17 mi (1,080.14 km) |
| Boulogne-sur-Mer to Crnomelj | 718.46 mi (1,156.24 km) |
| Boulogne-sur-Mer to Destrnik | 712.82 mi (1,147.18 km) |
| Boulogne-sur-Mer to Divaca | 665.96 mi (1,071.76 km) |
| Boulogne-sur-Mer to Dobje | 705.36 mi (1,135.16 km) |
| Boulogne-sur-Mer to Dobrna | 691.38 mi (1,112.67 km) |
| Boulogne-sur-Mer to Dobrova | 668.90 mi (1,076.49 km) |
