| Clay to Cocentaina | 4,629.94 mi (7,451.17 km) |
| Clay to Coin | 4,477.18 mi (7,205.33 km) |
| Clay to Colindres | 4,356.63 mi (7,011.31 km) |
| Clay to Collado-Villalba | 4,403.36 mi (7,086.53 km) |
| Clay to Colmenar Viejo | 4,414.36 mi (7,104.23 km) |
| Clay to Colmenarejo | 4,404.91 mi (7,089.02 km) |
| Clay to Conil de la Frontera | 4,420.99 mi (7,114.90 km) |
| Clay to Consuegra | 4,455.04 mi (7,169.70 km) |
| Clay to Corbera de Llobregat | 4,662.90 mi (7,504.21 km) |
| Clay to Cordoba | 4,441.22 mi (7,147.46 km) |
| Clay to Coria del Rio | 4,394.30 mi (7,071.94 km) |
| Clay to Crevillente | 4,626.81 mi (7,446.13 km) |
| Clay to Cuarte de Huerva | 4,524.48 mi (7,281.45 km) |
| Clay to Cubellas | 4,657.06 mi (7,494.82 km) |
| Clay to Cuellar | 4,368.14 mi (7,029.83 km) |
