| Harpenden to Alenquer | 975.45 mi (1,569.83 km) |
| Harpenden to Alfena | 826.59 mi (1,330.27 km) |
| Harpenden to Alijo | 802.22 mi (1,291.04 km) |
| Harpenden to Aljustrel | 1,032.44 mi (1,661.54 km) |
| Harpenden to Almada | 1,001.97 mi (1,612.51 km) |
| Harpenden to Almargem | 993.62 mi (1,599.07 km) |
| Harpenden to Almeirim | 957.77 mi (1,541.39 km) |
| Harpenden to Amadora | 1,000.12 mi (1,609.53 km) |
| Harpenden to Amarante | 814.91 mi (1,311.46 km) |
| Harpenden to Amares | 798.69 mi (1,285.36 km) |
| Harpenden to Amora | 1,004.61 mi (1,616.76 km) |
| Harpenden to Anadia | 875.34 mi (1,408.72 km) |
| Harpenden to Angra do Heroismo | 1,577.61 mi (2,538.92 km) |
| Harpenden to Ansiao | 908.22 mi (1,461.64 km) |
| Harpenden to Anta | 843.24 mi (1,357.06 km) |
