| Harpenden to Cadiz | 1,095.32 mi (1,762.75 km) |
| Harpenden to Calafell | 739.17 mi (1,189.58 km) |
| Harpenden to Calahorra | 661.93 mi (1,065.27 km) |
| Harpenden to Calasparra | 941.02 mi (1,514.43 km) |
| Harpenden to Calatayud | 725.76 mi (1,167.99 km) |
| Harpenden to Caldas de Montbuy | 713.63 mi (1,148.47 km) |
| Harpenden to Caldas de Reyes | 744.98 mi (1,198.92 km) |
| Harpenden to Calella | 718.97 mi (1,157.07 km) |
| Harpenden to Callosa de Segura | 946.58 mi (1,523.37 km) |
| Harpenden to Calpe | 910.33 mi (1,465.04 km) |
| Harpenden to Calvia | 857.51 mi (1,380.03 km) |
| Harpenden to Camas | 1,033.67 mi (1,663.53 km) |
| Harpenden to Cambados | 755.15 mi (1,215.29 km) |
| Harpenden to Cambre | 696.37 mi (1,120.70 km) |
| Harpenden to Cambrils | 745.77 mi (1,200.20 km) |
