| Harpenden to Collegno | 589.85 mi (949.27 km) |
| Harpenden to Cologno al Serio | 627.98 mi (1,010.63 km) |
| Harpenden to Cologno Monzese | 617.00 mi (992.96 km) |
| Harpenden to Colorno | 683.53 mi (1,100.04 km) |
| Harpenden to Comacchio | 756.03 mi (1,216.71 km) |
| Harpenden to Comiso | 1,259.74 mi (2,027.36 km) |
| Harpenden to Como | 596.34 mi (959.72 km) |
| Harpenden to Concordia Sagittaria | 730.32 mi (1,175.34 km) |
| Harpenden to Concorezzo | 615.72 mi (990.91 km) |
| Harpenden to Conegliano | 704.59 mi (1,133.92 km) |
| Harpenden to Conselice | 753.06 mi (1,211.94 km) |
| Harpenden to Conselve | 719.21 mi (1,157.46 km) |
| Harpenden to Conversano | 1,115.06 mi (1,794.52 km) |
| Harpenden to Copertino | 1,183.73 mi (1,905.03 km) |
| Harpenden to Copparo | 734.12 mi (1,181.46 km) |
