| Boulogne-sur-Mer to Civita Castellana | 774.80 mi (1,246.91 km) |
| Boulogne-sur-Mer to Civitanova Marche | 765.86 mi (1,232.53 km) |
| Boulogne-sur-Mer to Civitavecchia | 767.08 mi (1,234.50 km) |
| Boulogne-sur-Mer to Civitella in Val di Chiana | 692.37 mi (1,114.27 km) |
| Boulogne-sur-Mer to Clusone | 508.10 mi (817.70 km) |
| Boulogne-sur-Mer to Coccaglio | 524.70 mi (844.42 km) |
| Boulogne-sur-Mer to Codigoro | 634.20 mi (1,020.64 km) |
| Boulogne-sur-Mer to Codogno | 536.17 mi (862.89 km) |
| Boulogne-sur-Mer to Codroipo | 616.00 mi (991.36 km) |
| Boulogne-sur-Mer to Cogoleto | 546.46 mi (879.44 km) |
| Boulogne-sur-Mer to Colle di Val d'Elsa | 674.89 mi (1,086.13 km) |
| Boulogne-sur-Mer to Colle Salvetti | 644.07 mi (1,036.53 km) |
| Boulogne-sur-Mer to Collecchio | 573.97 mi (923.71 km) |
| Boulogne-sur-Mer to Colleferro | 824.60 mi (1,327.07 km) |
| Boulogne-sur-Mer to Collegno | 477.66 mi (768.73 km) |
