| Harpenden to Caltagirone | 1,240.21 mi (1,995.93 km) |
| Harpenden to Caltanissetta | 1,212.55 mi (1,951.41 km) |
| Harpenden to Calvisano | 661.24 mi (1,064.16 km) |
| Harpenden to Calvizzano | 1,020.69 mi (1,642.65 km) |
| Harpenden to Camaiore | 733.68 mi (1,180.74 km) |
| Harpenden to Cameri | 598.59 mi (963.33 km) |
| Harpenden to Camisano Vicentino | 700.50 mi (1,127.35 km) |
| Harpenden to Campagna | 1,062.89 mi (1,710.56 km) |
| Harpenden to Campagnano di Roma | 896.43 mi (1,442.66 km) |
| Harpenden to Campi Bisenzio | 766.09 mi (1,232.90 km) |
| Harpenden to Campi Salentina | 1,175.68 mi (1,892.08 km) |
| Harpenden to Campiglia Marittima | 790.92 mi (1,272.86 km) |
| Harpenden to Campobasso | 1,000.41 mi (1,610.00 km) |
| Harpenden to Campobello di Licata | 1,222.82 mi (1,967.95 km) |
| Harpenden to Campobello di Mazara | 1,168.29 mi (1,880.19 km) |
