| Boulogne-sur-Mer to Carson (California) | 5,545.36 mi (8,924.40 km) |
| Boulogne-sur-Mer to Carson City (Nevada) | 5,286.34 mi (8,507.53 km) |
| Boulogne-sur-Mer to Carteret (New Jersey) | 3,564.90 mi (5,737.15 km) |
| Boulogne-sur-Mer to Cartersville (Georgia) | 4,292.73 mi (6,908.48 km) |
| Boulogne-sur-Mer to Carthage (Missouri) | 4,522.91 mi (7,278.92 km) |
| Boulogne-sur-Mer to Cary (Illinois) | 4,047.79 mi (6,514.29 km) |
| Boulogne-sur-Mer to Cary (North Carolina) | 3,969.69 mi (6,388.60 km) |
| Boulogne-sur-Mer to Casa de Oro-Mount Helix (California) | 5,565.15 mi (8,956.25 km) |
| Boulogne-sur-Mer to Casa Grande (Arizona) | 5,382.06 mi (8,661.59 km) |
| Boulogne-sur-Mer to Casas Adobes (Arizona) | 5,387.35 mi (8,670.10 km) |
| Boulogne-sur-Mer to Cascades (Virginia) | 3,761.93 mi (6,054.25 km) |
| Boulogne-sur-Mer to Casper (Wyoming) | 4,660.47 mi (7,500.31 km) |
| Boulogne-sur-Mer to Casselberry (Florida) | 4,416.49 mi (7,107.65 km) |
| Boulogne-sur-Mer to Castaic (California) | 5,520.31 mi (8,884.08 km) |
| Boulogne-sur-Mer to Castle Pines (Colorado) | 4,788.76 mi (7,706.77 km) |
