| Harpenden to Caño Martin Peña (Puerto Rico) | 4,191.75 mi (6,745.97 km) |
| Harpenden to Cañon City (Colorado) | 4,741.49 mi (7,630.69 km) |
| Harpenden to Canóvanas (Puerto Rico) | 4,188.66 mi (6,740.99 km) |
| Harpenden to Canton (Georgia) | 4,170.47 mi (6,711.73 km) |
| Harpenden to Canton (Illinois) | 4,082.64 mi (6,570.38 km) |
| Harpenden to Canton (Mississippi) | 4,474.60 mi (7,201.17 km) |
| Harpenden to Canton (Ohio) | 3,735.99 mi (6,012.50 km) |
| Harpenden to Canyon (Texas) | 4,806.18 mi (7,734.80 km) |
| Harpenden to Canyon Lake (California) | 5,408.29 mi (8,703.80 km) |
| Harpenden to Canyon Lake (Texas) | 4,938.12 mi (7,947.13 km) |
| Harpenden to Cape Coral (Florida) | 4,446.46 mi (7,155.88 km) |
| Harpenden to Cape Girardeau (Missouri) | 4,221.72 mi (6,794.20 km) |
| Harpenden to Carbondale (Illinois) | 4,188.62 mi (6,740.93 km) |
| Harpenden to Carlisle (Pennsylvania) | 3,597.34 mi (5,789.37 km) |
| Harpenden to Carlsbad (California) | 5,441.20 mi (8,756.76 km) |
