| Harpenden to Argentona | 720.80 mi (1,160.01 km) |
| Harpenden to Arico el Nuevo | 1,833.19 mi (2,950.23 km) |
| Harpenden to Armilla | 1,025.85 mi (1,650.95 km) |
| Harpenden to Arnedo | 668.39 mi (1,075.66 km) |
| Harpenden to Arona | 1,843.28 mi (2,966.48 km) |
| Harpenden to Arrecife | 1,718.91 mi (2,766.32 km) |
| Harpenden to Arrigorriaga | 606.41 mi (975.92 km) |
| Harpenden to Arroyomolinos | 815.76 mi (1,312.84 km) |
| Harpenden to Arteijo | 699.52 mi (1,125.77 km) |
| Harpenden to Arucas | 1,815.53 mi (2,921.81 km) |
| Harpenden to Aspe | 931.04 mi (1,498.36 km) |
| Harpenden to Astorga | 699.58 mi (1,125.86 km) |
| Harpenden to Atarfe | 1,021.42 mi (1,643.82 km) |
| Harpenden to Avila | 798.51 mi (1,285.08 km) |
| Harpenden to Aviles | 626.13 mi (1,007.66 km) |
