| Harpenden to Yverdon-les-Bains | 469.16 mi (755.03 km) |
| Harpenden to Zofingen | 485.37 mi (781.13 km) |
| Harpenden to Zollikon | 505.05 mi (812.80 km) |
| Harpenden to Zuchwil | 476.51 mi (766.88 km) |
| Harpenden to Zug | 510.89 mi (822.20 km) |
| Harpenden to Zurich | 502.28 mi (808.34 km) |
| Harpenden to Ra's al `Ayn | 2,211.44 mi (3,558.97 km) |
| Harpenden to Tall Abyad | 2,171.92 mi (3,495.37 km) |
| Harpenden to Acarlar | 1,666.09 mi (2,681.32 km) |
| Harpenden to Acigol | 1,904.35 mi (3,064.75 km) |
| Harpenden to Acipayam | 1,747.92 mi (2,813.00 km) |
| Harpenden to Adakli | 2,124.35 mi (3,418.81 km) |
| Harpenden to Adana | 2,007.91 mi (3,231.41 km) |
| Harpenden to Adilcevaz | 2,238.53 mi (3,602.56 km) |
| Harpenden to Adiyaman | 2,095.53 mi (3,372.43 km) |
