| Watford to Castrovillari | 1,139.19 mi (1,833.35 km) |
| Watford to Catania | 1,234.52 mi (1,986.77 km) |
| Watford to Catanzaro | 1,202.27 mi (1,934.87 km) |
| Watford to Cattolica | 806.12 mi (1,297.33 km) |
| Watford to Cava de' Tirreni | 1,042.19 mi (1,677.24 km) |
| Watford to Cavallino | 1,181.57 mi (1,901.56 km) |
| Watford to Cavarzere | 726.67 mi (1,169.47 km) |
| Watford to Cave | 924.78 mi (1,488.28 km) |
| Watford to Cavriago | 694.67 mi (1,117.96 km) |
| Watford to Cavriglia | 787.20 mi (1,266.87 km) |
| Watford to Cazzago San Martino | 633.47 mi (1,019.47 km) |
| Watford to Ceccano | 951.11 mi (1,530.67 km) |
| Watford to Cecina | 767.46 mi (1,235.11 km) |
| Watford to Cefalu | 1,172.03 mi (1,886.20 km) |
| Watford to Ceglie Messapico | 1,139.80 mi (1,834.33 km) |
