| Harpenden to Coudekerque-Branche | 130.28 mi (209.66 km) |
| Harpenden to Coueron | 323.83 mi (521.16 km) |
| Harpenden to Coulommiers | 256.84 mi (413.35 km) |
| Harpenden to Courbevoic | 232.10 mi (373.53 km) |
| Harpenden to Courcouronnes | 252.57 mi (406.47 km) |
| Harpenden to Cournon-d'Auvergne | 449.66 mi (723.66 km) |
| Harpenden to Courrieres | 171.10 mi (275.36 km) |
| Harpenden to Coutras | 468.34 mi (753.71 km) |
| Harpenden to Couzeix | 416.81 mi (670.79 km) |
| Harpenden to Cran-Gevrier | 502.66 mi (808.95 km) |
| Harpenden to Craponne | 478.70 mi (770.40 km) |
| Harpenden to Creil | 216.23 mi (348.00 km) |
| Harpenden to Crepy-en-Valois | 228.22 mi (367.28 km) |
| Harpenden to Crest | 548.28 mi (882.37 km) |
| Harpenden to Creteil | 243.18 mi (391.37 km) |
