| Watford to Amelia | 868.69 mi (1,398.03 km) |
| Watford to Anagni | 936.00 mi (1,506.34 km) |
| Watford to Ancona | 850.71 mi (1,369.08 km) |
| Watford to Andria | 1,068.77 mi (1,720.01 km) |
| Watford to Angri | 1,036.06 mi (1,667.37 km) |
| Watford to Anguillara Sabazia | 889.20 mi (1,431.03 km) |
| Watford to Anzio | 935.48 mi (1,505.52 km) |
| Watford to Anzola dell'Emilia | 724.54 mi (1,166.04 km) |
| Watford to Aosta | 538.96 mi (867.38 km) |
| Watford to Apricena | 1,010.51 mi (1,626.26 km) |
| Watford to Aprilia | 928.63 mi (1,494.49 km) |
| Watford to Aradeo | 1,188.63 mi (1,912.91 km) |
| Watford to Aragona | 1,198.13 mi (1,928.20 km) |
| Watford to Arco | 647.51 mi (1,042.07 km) |
| Watford to Arcola | 704.97 mi (1,134.54 km) |
