| Hard to Coin | 1,049.09 mi (1,688.35 km) |
| Hard to Colindres | 695.70 mi (1,119.62 km) |
| Hard to Collado-Villalba | 826.91 mi (1,330.79 km) |
| Hard to Colmenar Viejo | 816.00 mi (1,313.22 km) |
| Hard to Colmenarejo | 830.46 mi (1,336.49 km) |
| Hard to Conil de la Frontera | 1,118.32 mi (1,799.76 km) |
| Hard to Consuegra | 865.11 mi (1,392.27 km) |
| Hard to Corbera de Llobregat | 567.28 mi (912.95 km) |
| Hard to Cordoba | 987.23 mi (1,588.80 km) |
| Hard to Coria del Rio | 1,065.20 mi (1,714.28 km) |
| Hard to Crevillente | 829.29 mi (1,334.62 km) |
| Hard to Cuarte de Huerva | 661.87 mi (1,065.17 km) |
| Hard to Cubellas | 586.83 mi (944.41 km) |
| Hard to Cuellar | 806.96 mi (1,298.68 km) |
| Hard to Cuenca | 780.68 mi (1,256.39 km) |
