| Harpenden to Trim | 295.07 mi (474.87 km) |
| Harpenden to Tuam | 374.65 mi (602.95 km) |
| Harpenden to Tullamore | 316.44 mi (509.26 km) |
| Harpenden to Waterford | 289.52 mi (465.94 km) |
| Harpenden to Wexford | 261.62 mi (421.04 km) |
| Harpenden to Wicklow | 252.47 mi (406.31 km) |
| Harpenden to Abano Terme | 710.47 mi (1,143.39 km) |
| Harpenden to Abbiategrasso | 612.20 mi (985.24 km) |
| Harpenden to Acate | 1,251.78 mi (2,014.55 km) |
| Harpenden to Acerra | 1,023.81 mi (1,647.67 km) |
| Harpenden to Aci Castello | 1,239.78 mi (1,995.23 km) |
| Harpenden to Aci Catena | 1,236.82 mi (1,990.47 km) |
| Harpenden to Aci Sant'Antonio | 1,236.33 mi (1,989.69 km) |
| Harpenden to Acireale | 1,236.83 mi (1,990.49 km) |
| Harpenden to Acquaviva delle Fonti | 1,109.26 mi (1,785.18 km) |
