| Harpenden to Creutzwald | 358.21 mi (576.49 km) |
| Harpenden to Croissy-sur-Seine | 230.95 mi (371.68 km) |
| Harpenden to Croix | 170.72 mi (274.74 km) |
| Harpenden to Crosne | 247.75 mi (398.71 km) |
| Harpenden to Cuers | 663.64 mi (1,068.02 km) |
| Harpenden to Cugnaux | 577.44 mi (929.31 km) |
| Harpenden to Cusset | 428.83 mi (690.13 km) |
| Harpenden to Dammarie-le-Lys | 263.62 mi (424.25 km) |
| Harpenden to Dammartin-en-Goele | 232.93 mi (374.87 km) |
| Harpenden to Dardilly | 475.65 mi (765.48 km) |
| Harpenden to Darnetal | 176.68 mi (284.34 km) |
| Harpenden to Dax | 561.10 mi (903.01 km) |
| Harpenden to Decines-Charpieu | 482.49 mi (776.48 km) |
| Harpenden to Denain | 192.45 mi (309.71 km) |
| Harpenden to Deuil-la-Barre | 228.99 mi (368.53 km) |
