| Watford to Cehegin | 939.55 mi (1,512.05 km) |
| Watford to Cervello | 717.50 mi (1,154.70 km) |
| Watford to Cervera | 694.65 mi (1,117.94 km) |
| Watford to Ceuti | 938.98 mi (1,511.14 km) |
| Watford to Cheste | 841.35 mi (1,354.02 km) |
| Watford to Chiclana de la Frontera | 1,090.11 mi (1,754.37 km) |
| Watford to Chipiona | 1,072.57 mi (1,726.14 km) |
| Watford to Chiva | 841.95 mi (1,354.99 km) |
| Watford to Churriana de la Vega | 1,014.73 mi (1,633.04 km) |
| Watford to Ciempozuelos | 809.04 mi (1,302.03 km) |
| Watford to Cieza | 928.27 mi (1,493.90 km) |
| Watford to Cisterniga | 722.46 mi (1,162.69 km) |
| Watford to Ciudad de Melilla | 1,138.26 mi (1,831.86 km) |
| Watford to Ciudad Real | 891.81 mi (1,435.23 km) |
| Watford to Ciudad-Rodrigo | 818.00 mi (1,316.44 km) |
