| Harpenden to Chojnice | 757.66 mi (1,219.34 km) |
| Harpenden to Chojnow | 699.40 mi (1,125.57 km) |
| Harpenden to Chorzow | 842.25 mi (1,355.47 km) |
| Harpenden to Choszczno | 668.51 mi (1,075.86 km) |
| Harpenden to Chrzanow | 864.44 mi (1,391.19 km) |
| Harpenden to Ciechanow | 885.63 mi (1,425.29 km) |
| Harpenden to Ciechocinek | 808.54 mi (1,301.22 km) |
| Harpenden to Cieszyn | 839.09 mi (1,350.39 km) |
| Harpenden to Czarna Bialostocka | 993.49 mi (1,598.86 km) |
| Harpenden to Czarnkow | 716.15 mi (1,152.53 km) |
| Harpenden to Czechowice-Dziedzice | 851.78 mi (1,370.81 km) |
| Harpenden to Czeladz | 847.36 mi (1,363.70 km) |
| Harpenden to Czersk Pomorski | 775.26 mi (1,247.67 km) |
| Harpenden to Czestochowa | 841.31 mi (1,353.96 km) |
| Harpenden to Czluchow | 750.07 mi (1,207.11 km) |
