| Harpenden to Cognac | 422.97 mi (680.70 km) |
| Harpenden to Cogolin | 672.56 mi (1,082.37 km) |
| Harpenden to Colmar | 428.65 mi (689.84 km) |
| Harpenden to Colombes | 230.52 mi (370.98 km) |
| Harpenden to Colomiers | 572.18 mi (920.84 km) |
| Harpenden to Combs-la-Ville | 252.65 mi (406.60 km) |
| Harpenden to Comines | 162.49 mi (261.50 km) |
| Harpenden to Compiegne | 216.61 mi (348.60 km) |
| Harpenden to Concarneau | 315.25 mi (507.35 km) |
| Harpenden to Conde-sur-l'Escaut | 195.32 mi (314.33 km) |
| Harpenden to Conflans-Sainte-Honorine | 222.60 mi (358.24 km) |
| Harpenden to Corbas | 487.39 mi (784.37 km) |
| Harpenden to Corbeil-Essonnes | 254.31 mi (409.28 km) |
| Harpenden to Cormeilles-en-Parisis | 226.36 mi (364.29 km) |
| Harpenden to Cosne sur Loire | 337.93 mi (543.84 km) |
