| Watford to Campo de Criptana | 856.76 mi (1,378.82 km) |
| Watford to Campos del Puerto | 860.39 mi (1,384.66 km) |
| Watford to Canals | 877.11 mi (1,411.57 km) |
| Watford to Candelaria | 1,809.34 mi (2,911.85 km) |
| Watford to Canet de Mar | 709.41 mi (1,141.68 km) |
| Watford to Cangas | 758.74 mi (1,221.07 km) |
| Watford to Cangas de Narcea | 652.19 mi (1,049.60 km) |
| Watford to Canovellas | 704.92 mi (1,134.46 km) |
| Watford to Canteras | 970.78 mi (1,562.31 km) |
| Watford to Cantillana | 1,006.32 mi (1,619.51 km) |
| Watford to Capdepera | 846.13 mi (1,361.72 km) |
| Watford to Carballo | 698.98 mi (1,124.89 km) |
| Watford to Carcagente | 865.94 mi (1,393.59 km) |
| Watford to Cardedeu | 704.02 mi (1,133.02 km) |
| Watford to Carlet | 858.75 mi (1,382.03 km) |
