| Harpenden to Cortona | 822.22 mi (1,323.23 km) |
| Harpenden to Cosenza | 1,174.82 mi (1,890.70 km) |
| Harpenden to Cossato | 580.18 mi (933.71 km) |
| Harpenden to Costa Volpino | 629.11 mi (1,012.46 km) |
| Harpenden to Creazzo | 691.45 mi (1,112.78 km) |
| Harpenden to Crema | 638.44 mi (1,027.47 km) |
| Harpenden to Cremona | 661.82 mi (1,065.10 km) |
| Harpenden to Crevalcore | 719.96 mi (1,158.66 km) |
| Harpenden to Crispiano | 1,138.07 mi (1,831.55 km) |
| Harpenden to Crosia | 1,177.15 mi (1,894.44 km) |
| Harpenden to Crotone | 1,214.97 mi (1,955.31 km) |
| Harpenden to Cuneo | 629.13 mi (1,012.48 km) |
| Harpenden to Cuorgne | 574.55 mi (924.65 km) |
| Harpenden to Cusano Milanino | 612.84 mi (986.27 km) |
| Harpenden to Cutro | 1,213.32 mi (1,952.65 km) |
