| Delaware to Cocentaina | 4,232.11 mi (6,810.92 km) |
| Delaware to Coin | 4,099.97 mi (6,598.26 km) |
| Delaware to Colindres | 3,941.09 mi (6,342.57 km) |
| Delaware to Collado-Villalba | 4,002.93 mi (6,442.09 km) |
| Delaware to Colmenar Viejo | 4,013.33 mi (6,458.83 km) |
| Delaware to Colmenarejo | 4,004.88 mi (6,445.22 km) |
| Delaware to Conil de la Frontera | 4,049.19 mi (6,516.54 km) |
| Delaware to Consuegra | 4,060.01 mi (6,533.96 km) |
| Delaware to Corbera de Llobregat | 4,247.50 mi (6,835.68 km) |
| Delaware to Cordoba | 4,057.25 mi (6,529.51 km) |
| Delaware to Coria del Rio | 4,016.54 mi (6,464.00 km) |
| Delaware to Crevillente | 4,232.29 mi (6,811.21 km) |
| Delaware to Cuarte de Huerva | 4,113.49 mi (6,620.03 km) |
| Delaware to Cubellas | 4,243.09 mi (6,828.60 km) |
| Delaware to Cuellar | 3,964.24 mi (6,379.84 km) |
