| Harpenden to Castrovillari | 1,144.93 mi (1,842.58 km) |
| Harpenden to Catania | 1,241.40 mi (1,997.84 km) |
| Harpenden to Catanzaro | 1,208.19 mi (1,944.39 km) |
| Harpenden to Cattolica | 811.30 mi (1,305.66 km) |
| Harpenden to Cava de' Tirreni | 1,048.14 mi (1,686.83 km) |
| Harpenden to Cavallino | 1,186.40 mi (1,909.33 km) |
| Harpenden to Cavarzere | 731.38 mi (1,177.05 km) |
| Harpenden to Cave | 930.98 mi (1,498.26 km) |
| Harpenden to Cavriago | 700.45 mi (1,127.26 km) |
| Harpenden to Cavriglia | 793.21 mi (1,276.55 km) |
| Harpenden to Cazzago San Martino | 638.90 mi (1,028.20 km) |
| Harpenden to Ceccano | 957.25 mi (1,540.55 km) |
| Harpenden to Cecina | 774.05 mi (1,245.71 km) |
| Harpenden to Cefalu | 1,179.13 mi (1,897.63 km) |
| Harpenden to Ceglie Messapico | 1,144.73 mi (1,842.27 km) |
