| Harpenden to Cehegin | 950.89 mi (1,530.31 km) |
| Harpenden to Cervello | 728.25 mi (1,172.01 km) |
| Harpenden to Cervera | 705.57 mi (1,135.51 km) |
| Harpenden to Ceuti | 950.29 mi (1,529.34 km) |
| Harpenden to Cheste | 852.61 mi (1,372.14 km) |
| Harpenden to Chiclana de la Frontera | 1,101.39 mi (1,772.51 km) |
| Harpenden to Chipiona | 1,083.81 mi (1,744.23 km) |
| Harpenden to Chiva | 853.21 mi (1,373.12 km) |
| Harpenden to Churriana de la Vega | 1,026.10 mi (1,651.35 km) |
| Harpenden to Ciempozuelos | 820.41 mi (1,320.32 km) |
| Harpenden to Cieza | 939.59 mi (1,512.12 km) |
| Harpenden to Cisterniga | 733.72 mi (1,180.81 km) |
| Harpenden to Ciudad de Melilla | 1,149.63 mi (1,850.16 km) |
| Harpenden to Ciudad Real | 903.17 mi (1,453.52 km) |
| Harpenden to Ciudad-Rodrigo | 829.05 mi (1,334.22 km) |
