| Watford to Collegno | 582.66 mi (937.70 km) |
| Watford to Cologno al Serio | 622.37 mi (1,001.61 km) |
| Watford to Cologno Monzese | 611.12 mi (983.49 km) |
| Watford to Colorno | 677.83 mi (1,090.86 km) |
| Watford to Comacchio | 751.06 mi (1,208.72 km) |
| Watford to Comiso | 1,252.55 mi (2,015.79 km) |
| Watford to Como | 590.56 mi (950.41 km) |
| Watford to Concordia Sagittaria | 726.45 mi (1,169.10 km) |
| Watford to Concorezzo | 609.92 mi (981.57 km) |
| Watford to Conegliano | 700.55 mi (1,127.43 km) |
| Watford to Conselice | 747.81 mi (1,203.49 km) |
| Watford to Conselve | 714.47 mi (1,149.83 km) |
| Watford to Conversano | 1,110.12 mi (1,786.57 km) |
| Watford to Copertino | 1,178.83 mi (1,897.15 km) |
| Watford to Copparo | 729.13 mi (1,173.42 km) |
