| Watford to Cabestany | 639.41 mi (1,029.04 km) |
| Watford to Cabries | 627.72 mi (1,010.21 km) |
| Watford to Cachan | 231.63 mi (372.78 km) |
| Watford to Caen | 171.01 mi (275.21 km) |
| Watford to Cagnes-sur-Mer | 653.50 mi (1,051.71 km) |
| Watford to Cahors | 505.12 mi (812.91 km) |
| Watford to Calais | 108.85 mi (175.18 km) |
| Watford to Caluire-et-Cuire | 469.85 mi (756.14 km) |
| Watford to Cambrai | 188.26 mi (302.97 km) |
| Watford to Canet-en-Roussillon | 638.47 mi (1,027.53 km) |
| Watford to Cannes | 656.98 mi (1,057.30 km) |
| Watford to Canteleu | 164.73 mi (265.11 km) |
| Watford to Capbreton | 555.73 mi (894.37 km) |
| Watford to Carcassonne | 597.32 mi (961.30 km) |
| Watford to Carmaux | 538.59 mi (866.78 km) |
