| Harpenden to Cabestany | 649.76 mi (1,045.69 km) |
| Harpenden to Cabries | 636.85 mi (1,024.91 km) |
| Harpenden to Cachan | 240.24 mi (386.63 km) |
| Harpenden to Caen | 182.24 mi (293.28 km) |
| Harpenden to Cagnes-sur-Mer | 661.64 mi (1,064.81 km) |
| Harpenden to Cahors | 515.84 mi (830.17 km) |
| Harpenden to Calais | 112.60 mi (181.21 km) |
| Harpenden to Caluire-et-Cuire | 478.37 mi (769.87 km) |
| Harpenden to Cambrai | 192.82 mi (310.32 km) |
| Harpenden to Canet-en-Roussillon | 648.80 mi (1,044.14 km) |
| Harpenden to Cannes | 665.23 mi (1,070.59 km) |
| Harpenden to Canteleu | 174.45 mi (280.75 km) |
| Harpenden to Capbreton | 567.09 mi (912.64 km) |
| Harpenden to Carcassonne | 607.83 mi (978.21 km) |
| Harpenden to Carmaux | 549.09 mi (883.67 km) |
