| Harpenden to Chatteris | 47.38 mi (76.25 km) |
| Harpenden to Cheadle | 106.07 mi (170.70 km) |
| Harpenden to Cheadle Hulme | 132.44 mi (213.14 km) |
| Harpenden to Cheam | 32.20 mi (51.81 km) |
| Harpenden to Chellaston | 85.79 mi (138.07 km) |
| Harpenden to Chelmsford | 36.10 mi (58.09 km) |
| Harpenden to Chelsfield | 37.84 mi (60.90 km) |
| Harpenden to Cheltenham | 73.37 mi (118.08 km) |
| Harpenden to Chepstow | 100.13 mi (161.14 km) |
| Harpenden to Cherry Hinton | 33.91 mi (54.57 km) |
| Harpenden to Chertsey | 30.26 mi (48.70 km) |
| Harpenden to Chesham | 13.28 mi (21.37 km) |
| Harpenden to Cheshunt | 15.75 mi (25.34 km) |
| Harpenden to Chester | 142.75 mi (229.74 km) |
| Harpenden to Chester-le-Street | 216.08 mi (347.75 km) |
