| Harpenden to Clacton-on-Sea | 64.03 mi (103.04 km) |
| Harpenden to Clay Cross | 103.16 mi (166.01 km) |
| Harpenden to Clayton | 148.82 mi (239.50 km) |
| Harpenden to Clayton le Moors | 159.66 mi (256.95 km) |
| Harpenden to Cleckheaton | 143.64 mi (231.16 km) |
| Harpenden to Cleethorpes | 120.73 mi (194.30 km) |
| Harpenden to Clevedon | 110.45 mi (177.75 km) |
| Harpenden to Clifton | 82.74 mi (133.16 km) |
| Harpenden to Clifton | 152.07 mi (244.74 km) |
| Harpenden to Cliftonville | 81.03 mi (130.40 km) |
| Harpenden to Clitheroe | 165.44 mi (266.24 km) |
| Harpenden to Clydebank | 326.62 mi (525.65 km) |
| Harpenden to Coalville | 75.96 mi (122.25 km) |
| Harpenden to Coatbridge | 316.99 mi (510.14 km) |
| Harpenden to Cobham | 33.84 mi (54.46 km) |
