| Harpenden to Irun | 589.67 mi (948.98 km) |
| Harpenden to Isla-Cristina | 1,065.60 mi (1,714.91 km) |
| Harpenden to Jaca | 640.39 mi (1,030.61 km) |
| Harpenden to Jaen | 984.90 mi (1,585.04 km) |
| Harpenden to Jerez de la Frontera | 1,083.41 mi (1,743.57 km) |
| Harpenden to Jerez de los Caballeros | 982.81 mi (1,581.68 km) |
| Harpenden to Jodar | 977.10 mi (1,572.49 km) |
| Harpenden to Jumilla | 922.78 mi (1,485.08 km) |
| Harpenden to La Algaba | 1,030.02 mi (1,657.65 km) |
| Harpenden to La Baneza | 707.22 mi (1,138.16 km) |
| Harpenden to La Carlota | 1,002.72 mi (1,613.73 km) |
| Harpenden to La Carolina | 949.48 mi (1,528.05 km) |
| Harpenden to La Corredoria | 635.43 mi (1,022.63 km) |
| Harpenden to La Eliana | 846.53 mi (1,362.36 km) |
| Harpenden to La Escala | 690.13 mi (1,110.66 km) |
