| Slough to Cocentaina | 881.89 mi (1,419.27 km) |
| Slough to Coin | 1,045.62 mi (1,682.76 km) |
| Slough to Colindres | 576.05 mi (927.07 km) |
| Slough to Collado-Villalba | 768.85 mi (1,237.34 km) |
| Slough to Colmenar Viejo | 764.75 mi (1,230.74 km) |
| Slough to Colmenarejo | 773.85 mi (1,245.39 km) |
| Slough to Conil de la Frontera | 1,087.29 mi (1,749.82 km) |
| Slough to Consuegra | 844.88 mi (1,359.71 km) |
| Slough to Corbera de Llobregat | 707.38 mi (1,138.41 km) |
| Slough to Cordoba | 963.15 mi (1,550.05 km) |
| Slough to Coria del Rio | 1,018.45 mi (1,639.04 km) |
| Slough to Crevillente | 916.23 mi (1,474.52 km) |
| Slough to Cuarte de Huerva | 685.93 mi (1,103.90 km) |
| Slough to Cubellas | 719.58 mi (1,158.06 km) |
| Slough to Cuellar | 720.28 mi (1,159.17 km) |
