| Watford to Barking | 21.91 mi (35.26 km) |
| Watford to Barnet | 8.43 mi (13.57 km) |
| Watford to Barnoldswick | 173.18 mi (278.70 km) |
| Watford to Barnsley | 138.90 mi (223.54 km) |
| Watford to Barnstaple | 162.96 mi (262.26 km) |
| Watford to Barrhead | 329.58 mi (530.40 km) |
| Watford to Barri | 124.74 mi (200.75 km) |
| Watford to Barrow in Furness | 206.65 mi (332.56 km) |
| Watford to Barton upon Humber | 140.16 mi (225.57 km) |
| Watford to Barton upon Irwell | 150.44 mi (242.11 km) |
| Watford to Barwell | 74.88 mi (120.51 km) |
| Watford to Basford | 97.07 mi (156.22 km) |
| Watford to Basildon | 38.35 mi (61.72 km) |
| Watford to Basingstoke | 40.09 mi (64.51 km) |
| Watford to Bath | 86.56 mi (139.31 km) |
