| Cities | Distance |
|---|---|
| Harpenden to Cromer | 103.86 mi (167.15 km) |
| Harpenden to Crosby | 161.06 mi (259.19 km) |
| Harpenden to Crowborough | 56.80 mi (91.41 km) |
| Harpenden to Croxley Green | 12.43 mi (20.00 km) |
| Harpenden to Croydon | 32.45 mi (52.22 km) |
| Harpenden to Cudworth | 129.54 mi (208.48 km) |
| Harpenden to Culcheth | 144.98 mi (233.33 km) |
| Harpenden to Cullercoats | 226.57 mi (364.63 km) |
| Harpenden to Cumbernauld | 321.34 mi (517.14 km) |
| Harpenden to Cumnock | 297.84 mi (479.32 km) |
| Harpenden to Cupar | 329.16 mi (529.74 km) |
| Harpenden to Cwmbran | 114.75 mi (184.66 km) |
| Harpenden to Dagenham | 28.59 mi (46.01 km) |
| Harpenden to Dalkeith | 302.53 mi (486.88 km) |
| Harpenden to Darfield | 126.44 mi (203.49 km) |