| Boulogne-sur-Mer to Caño Martin Peña (Puerto Rico) | 4,268.09 mi (6,868.82 km) |
| Boulogne-sur-Mer to Cañon City (Colorado) | 4,854.66 mi (7,812.82 km) |
| Boulogne-sur-Mer to Canóvanas (Puerto Rico) | 4,264.74 mi (6,863.44 km) |
| Boulogne-sur-Mer to Canton (Georgia) | 4,276.04 mi (6,881.62 km) |
| Boulogne-sur-Mer to Canton (Illinois) | 4,193.37 mi (6,748.57 km) |
| Boulogne-sur-Mer to Canton (Mississippi) | 4,581.83 mi (7,373.75 km) |
| Boulogne-sur-Mer to Canton (Ohio) | 3,844.05 mi (6,186.41 km) |
| Boulogne-sur-Mer to Canyon (Texas) | 4,918.20 mi (7,915.07 km) |
| Boulogne-sur-Mer to Canyon Lake (California) | 5,521.92 mi (8,886.67 km) |
| Boulogne-sur-Mer to Canyon Lake (Texas) | 5,047.53 mi (8,123.22 km) |
| Boulogne-sur-Mer to Cape Coral (Florida) | 4,545.45 mi (7,315.20 km) |
| Boulogne-sur-Mer to Cape Girardeau (Missouri) | 4,330.98 mi (6,970.03 km) |
| Boulogne-sur-Mer to Carbondale (Illinois) | 4,297.94 mi (6,916.86 km) |
| Boulogne-sur-Mer to Carlisle (Pennsylvania) | 3,703.34 mi (5,959.94 km) |
| Boulogne-sur-Mer to Carlsbad (California) | 5,554.82 mi (8,939.63 km) |
