| Harpenden to Carterton | 53.04 mi (85.36 km) |
| Harpenden to Castle Bromwich | 77.11 mi (124.10 km) |
| Harpenden to Castleford | 137.72 mi (221.63 km) |
| Harpenden to Castleton | 144.30 mi (232.22 km) |
| Harpenden to Caterham | 38.90 mi (62.60 km) |
| Harpenden to Catford | 29.39 mi (47.31 km) |
| Harpenden to Caversham | 35.98 mi (57.90 km) |
| Harpenden to Chaddesden | 89.48 mi (144.01 km) |
| Harpenden to Chalfont Saint Peter | 16.96 mi (27.29 km) |
| Harpenden to Chandlers Ford | 72.63 mi (116.89 km) |
| Harpenden to Chapel en le Frith | 122.97 mi (197.90 km) |
| Harpenden to Chapeltown | 122.84 mi (197.69 km) |
| Harpenden to Chard | 130.04 mi (209.27 km) |
| Harpenden to Charlton Kings | 72.24 mi (116.26 km) |
| Harpenden to Chatham | 48.56 mi (78.15 km) |
