| Watford to Cividale del Friuli | 734.56 mi (1,182.16 km) |
| Watford to Civita Castellana | 882.14 mi (1,419.67 km) |
| Watford to Civitanova Marche | 873.99 mi (1,406.56 km) |
| Watford to Civitavecchia | 873.81 mi (1,406.26 km) |
| Watford to Civitella in Val di Chiana | 800.04 mi (1,287.54 km) |
| Watford to Clusone | 616.23 mi (991.72 km) |
| Watford to Coccaglio | 632.76 mi (1,018.33 km) |
| Watford to Codigoro | 742.31 mi (1,194.64 km) |
| Watford to Codogno | 643.89 mi (1,036.25 km) |
| Watford to Codroipo | 722.94 mi (1,163.45 km) |
| Watford to Cogoleto | 652.15 mi (1,049.53 km) |
| Watford to Colle di Val d'Elsa | 782.18 mi (1,258.79 km) |
| Watford to Colle Salvetti | 751.00 mi (1,208.62 km) |
| Watford to Collecchio | 681.69 mi (1,097.07 km) |
| Watford to Colleferro | 931.96 mi (1,499.85 km) |
