| Harpenden to Castelletto sopra Ticino | 586.66 mi (944.14 km) |
| Harpenden to Castelli Calepio | 632.11 mi (1,017.29 km) |
| Harpenden to Castelnovo ne' Monti | 710.08 mi (1,142.76 km) |
| Harpenden to Castelnuovo Berardenga | 802.93 mi (1,292.19 km) |
| Harpenden to Castelnuovo di Porto | 900.07 mi (1,448.52 km) |
| Harpenden to Castelnuovo di Verona | 671.33 mi (1,080.40 km) |
| Harpenden to Castelnuovo Rangone | 721.27 mi (1,160.77 km) |
| Harpenden to Castelvetrano | 1,166.41 mi (1,877.15 km) |
| Harpenden to Castelvetro di Modena | 724.40 mi (1,165.80 km) |
| Harpenden to Castenaso | 741.17 mi (1,192.80 km) |
| Harpenden to Castenedolo | 653.53 mi (1,051.76 km) |
| Harpenden to Castiglion Fiorentino | 816.37 mi (1,313.81 km) |
| Harpenden to Castiglione del Lago | 831.42 mi (1,338.04 km) |
| Harpenden to Castiglione delle Stiviere | 663.89 mi (1,068.42 km) |
| Harpenden to Castrolibero | 1,172.29 mi (1,886.62 km) |
