| Harpenden to Cuenca | 816.41 mi (1,313.89 km) |
| Harpenden to Cuevas del Almanzora | 1,005.77 mi (1,618.63 km) |
| Harpenden to Cullera | 874.29 mi (1,407.04 km) |
| Harpenden to Culleredo | 697.45 mi (1,122.43 km) |
| Harpenden to Cunit | 739.75 mi (1,190.51 km) |
| Harpenden to Daganzo de Arriba | 792.81 mi (1,275.91 km) |
| Harpenden to Daimiel | 893.72 mi (1,438.31 km) |
| Harpenden to Don Benito | 927.41 mi (1,492.52 km) |
| Harpenden to Donostia | 591.96 mi (952.67 km) |
| Harpenden to Dos Hermanas | 1,040.20 mi (1,674.03 km) |
| Harpenden to Durango | 606.87 mi (976.65 km) |
| Harpenden to Ecija | 1,013.39 mi (1,630.90 km) |
| Harpenden to Ejea de los Caballeros | 670.41 mi (1,078.92 km) |
| Harpenden to El Alamo | 819.15 mi (1,318.30 km) |
| Harpenden to El Arahal | 1,036.76 mi (1,668.50 km) |
