| Boulogne-sur-Mer to Ciampino | 808.03 mi (1,300.40 km) |
| Boulogne-sur-Mer to Cicciano | 914.63 mi (1,471.96 km) |
| Boulogne-sur-Mer to Cingoli | 744.69 mi (1,198.46 km) |
| Boulogne-sur-Mer to Cinisello Balsamo | 500.28 mi (805.13 km) |
| Boulogne-sur-Mer to Cinisi | 1,033.67 mi (1,663.53 km) |
| Boulogne-sur-Mer to Cirie | 469.32 mi (755.30 km) |
| Boulogne-sur-Mer to Ciro Marina | 1,086.24 mi (1,748.13 km) |
| Boulogne-sur-Mer to Cislago | 487.10 mi (783.91 km) |
| Boulogne-sur-Mer to Cisterna di Latina | 826.65 mi (1,330.37 km) |
| Boulogne-sur-Mer to Cisternino | 1,025.06 mi (1,649.68 km) |
| Boulogne-sur-Mer to Citta di Castello | 707.18 mi (1,138.10 km) |
| Boulogne-sur-Mer to Citta Sant'Angelo | 816.49 mi (1,314.02 km) |
| Boulogne-sur-Mer to Cittadella | 584.31 mi (940.36 km) |
| Boulogne-sur-Mer to Cittanova | 1,109.02 mi (1,784.79 km) |
| Boulogne-sur-Mer to Cividale del Friuli | 628.18 mi (1,010.95 km) |
