| Harpenden to Civril | 1,721.54 mi (2,770.55 km) |
| Harpenden to Cizre | 2,278.79 mi (3,667.37 km) |
| Harpenden to Cobanlar | 1,744.95 mi (2,808.22 km) |
| Harpenden to Corlu | 1,515.12 mi (2,438.34 km) |
| Harpenden to Corum | 1,836.61 mi (2,955.74 km) |
| Harpenden to Cukurca | 2,342.80 mi (3,770.37 km) |
| Harpenden to Cukurcayir | 2,021.21 mi (3,252.83 km) |
| Harpenden to Cumayeri | 1,656.06 mi (2,665.17 km) |
| Harpenden to Cumra | 1,877.49 mi (3,021.53 km) |
| Harpenden to Cungus | 2,117.95 mi (3,408.52 km) |
| Harpenden to Dargecit | 2,249.73 mi (3,620.59 km) |
| Harpenden to Davutlar | 1,652.85 mi (2,660.01 km) |
| Harpenden to Demirozu | 2,060.59 mi (3,316.20 km) |
| Harpenden to Demre | 1,829.99 mi (2,945.09 km) |
| Harpenden to Denizciler | 2,060.85 mi (3,316.61 km) |
