| Harpenden to Chivasso | 592.45 mi (953.46 km) |
| Harpenden to Ciampino | 921.51 mi (1,483.02 km) |
| Harpenden to Cicciano | 1,028.26 mi (1,654.82 km) |
| Harpenden to Cingoli | 858.11 mi (1,380.99 km) |
| Harpenden to Cinisello Balsamo | 613.91 mi (987.99 km) |
| Harpenden to Cinisi | 1,145.63 mi (1,843.71 km) |
| Harpenden to Cirie | 581.75 mi (936.24 km) |
| Harpenden to Ciro Marina | 1,199.80 mi (1,930.89 km) |
| Harpenden to Cislago | 600.72 mi (966.77 km) |
| Harpenden to Cisterna di Latina | 940.14 mi (1,513.00 km) |
| Harpenden to Cisternino | 1,138.11 mi (1,831.61 km) |
| Harpenden to Citta di Castello | 820.79 mi (1,320.94 km) |
| Harpenden to Citta Sant'Angelo | 929.97 mi (1,496.65 km) |
| Harpenden to Cittadella | 696.67 mi (1,121.18 km) |
| Harpenden to Cittanova | 1,222.55 mi (1,967.50 km) |
