| Boulogne-sur-Mer to Catania | 1,128.45 mi (1,816.06 km) |
| Boulogne-sur-Mer to Catanzaro | 1,094.56 mi (1,761.52 km) |
| Boulogne-sur-Mer to Cattolica | 697.99 mi (1,123.30 km) |
| Boulogne-sur-Mer to Cava de' Tirreni | 934.52 mi (1,503.96 km) |
| Boulogne-sur-Mer to Cavallino | 1,073.47 mi (1,727.58 km) |
| Boulogne-sur-Mer to Cavarzere | 618.63 mi (995.59 km) |
| Boulogne-sur-Mer to Cave | 817.42 mi (1,315.50 km) |
| Boulogne-sur-Mer to Cavriago | 586.82 mi (944.40 km) |
| Boulogne-sur-Mer to Cavriglia | 679.59 mi (1,093.70 km) |
| Boulogne-sur-Mer to Cazzago San Martino | 525.39 mi (845.54 km) |
| Boulogne-sur-Mer to Ceccano | 843.67 mi (1,357.76 km) |
| Boulogne-sur-Mer to Cecina | 660.79 mi (1,063.43 km) |
| Boulogne-sur-Mer to Cefalu | 1,066.56 mi (1,716.46 km) |
| Boulogne-sur-Mer to Ceglie Messapico | 1,031.67 mi (1,660.31 km) |
| Boulogne-sur-Mer to Celano | 822.71 mi (1,324.02 km) |
