| Boulogne-sur-Mer to Cogolin | 565.66 mi (910.35 km) |
| Boulogne-sur-Mer to Colmar | 316.10 mi (508.72 km) |
| Boulogne-sur-Mer to Colombes | 127.76 mi (205.61 km) |
| Boulogne-sur-Mer to Colomiers | 491.60 mi (791.15 km) |
| Boulogne-sur-Mer to Combs-la-Ville | 148.23 mi (238.55 km) |
| Boulogne-sur-Mer to Comines | 60.95 mi (98.10 km) |
| Boulogne-sur-Mer to Compiegne | 105.27 mi (169.42 km) |
| Boulogne-sur-Mer to Concarneau | 317.60 mi (511.13 km) |
| Boulogne-sur-Mer to Conde-sur-l'Escaut | 88.76 mi (142.85 km) |
| Boulogne-sur-Mer to Conflans-Sainte-Honorine | 121.27 mi (195.16 km) |
| Boulogne-sur-Mer to Corbas | 380.78 mi (612.80 km) |
| Boulogne-sur-Mer to Corbeil-Essonnes | 151.02 mi (243.05 km) |
| Boulogne-sur-Mer to Cormeilles-en-Parisis | 123.87 mi (199.36 km) |
| Boulogne-sur-Mer to Cosne sur Loire | 236.66 mi (380.87 km) |
| Boulogne-sur-Mer to Coudekerque-Branche | 39.67 mi (63.85 km) |
