| Watford to Cocentaina | 892.00 mi (1,435.53 km) |
| Watford to Coin | 1,057.35 mi (1,701.65 km) |
| Watford to Colindres | 587.96 mi (946.23 km) |
| Watford to Collado-Villalba | 780.66 mi (1,256.35 km) |
| Watford to Colmenar Viejo | 776.47 mi (1,249.60 km) |
| Watford to Colmenarejo | 785.66 mi (1,264.40 km) |
| Watford to Conil de la Frontera | 1,099.37 mi (1,769.26 km) |
| Watford to Consuegra | 856.44 mi (1,378.31 km) |
| Watford to Corbera de Llobregat | 715.88 mi (1,152.10 km) |
| Watford to Cordoba | 974.99 mi (1,569.09 km) |
| Watford to Coria del Rio | 1,030.60 mi (1,658.59 km) |
| Watford to Crevillente | 926.51 mi (1,491.07 km) |
| Watford to Cuarte de Huerva | 696.32 mi (1,120.62 km) |
| Watford to Cubellas | 728.30 mi (1,172.08 km) |
| Watford to Cuellar | 732.28 mi (1,178.49 km) |
