| Watford to Trezzo sull'Adda | 615.07 mi (989.86 km) |
| Watford to Tricase | 1,207.16 mi (1,942.74 km) |
| Watford to Trieste | 766.26 mi (1,233.18 km) |
| Watford to Triggiano | 1,097.99 mi (1,767.04 km) |
| Watford to Trinitapoli | 1,054.98 mi (1,697.82 km) |
| Watford to Trissino | 681.02 mi (1,096.00 km) |
| Watford to Triuggio | 603.75 mi (971.65 km) |
| Watford to Trofarello | 592.54 mi (953.60 km) |
| Watford to Troina | 1,203.59 mi (1,936.99 km) |
| Watford to Turin | 585.54 mi (942.34 km) |
| Watford to Udine | 728.26 mi (1,172.02 km) |
| Watford to Ugento | 1,200.13 mi (1,931.43 km) |
| Watford to Umbertide | 826.40 mi (1,329.96 km) |
| Watford to Urbino | 814.88 mi (1,311.43 km) |
| Watford to Urgnano | 621.51 mi (1,000.23 km) |
