| Watford to Castelfidardo | 859.30 mi (1,382.91 km) |
| Watford to Castelfiorentino | 766.20 mi (1,233.07 km) |
| Watford to Castelfranco di Sopra | 784.02 mi (1,261.76 km) |
| Watford to Castelfranco di Sotto | 753.98 mi (1,213.42 km) |
| Watford to Castelfranco Emilia | 717.24 mi (1,154.29 km) |
| Watford to Castelfranco Veneto | 696.91 mi (1,121.57 km) |
| Watford to Castellabate | 1,073.28 mi (1,727.28 km) |
| Watford to Castellammare del Golfo | 1,140.56 mi (1,835.55 km) |
| Watford to Castellammare di Stabia | 1,035.36 mi (1,666.25 km) |
| Watford to Castellamonte | 569.87 mi (917.11 km) |
| Watford to Castellana Grotte | 1,116.14 mi (1,796.25 km) |
| Watford to Castellaneta | 1,120.86 mi (1,803.85 km) |
| Watford to Castellanza | 594.29 mi (956.41 km) |
| Watford to Castellarano | 709.76 mi (1,142.24 km) |
| Watford to Castelleone | 638.82 mi (1,028.08 km) |
