| Harpenden to Warrington | 143.59 mi (231.08 km) |
| Harpenden to Warsop | 101.24 mi (162.93 km) |
| Harpenden to Warwick | 61.53 mi (99.03 km) |
| Harpenden to Washington | 218.35 mi (351.39 km) |
| Harpenden to Waterlooville | 71.07 mi (114.37 km) |
| Harpenden to Watford | 11.38 mi (18.31 km) |
| Harpenden to Wath upon Dearne | 123.54 mi (198.82 km) |
| Harpenden to Wealdstone | 15.34 mi (24.69 km) |
| Harpenden to Wednesfield | 91.04 mi (146.51 km) |
| Harpenden to Welling | 31.70 mi (51.01 km) |
| Harpenden to Wellingborough | 36.01 mi (57.96 km) |
| Harpenden to Wellington | 136.78 mi (220.13 km) |
| Harpenden to Wellington | 109.94 mi (176.94 km) |
| Harpenden to Wells | 107.15 mi (172.45 km) |
| Harpenden to Welwyn Garden City | 6.85 mi (11.02 km) |
