| Boulogne-sur-Mer to Carlsbad (New Mexico) | 5,141.01 mi (8,273.66 km) |
| Boulogne-sur-Mer to Carmel (Indiana) | 4,071.15 mi (6,551.88 km) |
| Boulogne-sur-Mer to Carmichael (California) | 5,362.99 mi (8,630.89 km) |
| Boulogne-sur-Mer to Carney (Maryland) | 3,710.58 mi (5,971.61 km) |
| Boulogne-sur-Mer to Carnot-Moon (Pennsylvania) | 3,811.04 mi (6,133.28 km) |
| Boulogne-sur-Mer to Carol Stream (Illinois) | 4,056.95 mi (6,529.03 km) |
| Boulogne-sur-Mer to Carolina (Puerto Rico) | 4,266.29 mi (6,865.93 km) |
| Boulogne-sur-Mer to Carolina Forest (South Carolina) | 4,068.09 mi (6,546.96 km) |
| Boulogne-sur-Mer to Carpentersville (Illinois) | 4,053.50 mi (6,523.48 km) |
| Boulogne-sur-Mer to Carpinteria (California) | 5,552.95 mi (8,936.62 km) |
| Boulogne-sur-Mer to Carrboro (North Carolina) | 3,974.13 mi (6,395.74 km) |
| Boulogne-sur-Mer to Carroll (Iowa) | 4,300.81 mi (6,921.48 km) |
| Boulogne-sur-Mer to Carrollton (Georgia) | 4,332.53 mi (6,972.53 km) |
| Boulogne-sur-Mer to Carrollton (Texas) | 4,832.90 mi (7,777.80 km) |
| Boulogne-sur-Mer to Carrollwood (Florida) | 4,497.01 mi (7,237.23 km) |
