| Harpenden to Carlsbad (New Mexico) | 5,029.06 mi (8,093.49 km) |
| Harpenden to Carmel (Indiana) | 3,961.85 mi (6,375.98 km) |
| Harpenden to Carmichael (California) | 5,249.89 mi (8,448.88 km) |
| Harpenden to Carney (Maryland) | 3,605.46 mi (5,802.43 km) |
| Harpenden to Carnot-Moon (Pennsylvania) | 3,703.59 mi (5,960.36 km) |
| Harpenden to Carol Stream (Illinois) | 3,946.22 mi (6,350.83 km) |
| Harpenden to Carolina (Puerto Rico) | 4,190.07 mi (6,743.27 km) |
| Harpenden to Carolina Forest (South Carolina) | 3,965.83 mi (6,382.38 km) |
| Harpenden to Carpentersville (Illinois) | 3,942.65 mi (6,345.08 km) |
| Harpenden to Carpinteria (California) | 5,439.39 mi (8,753.85 km) |
| Harpenden to Carrboro (North Carolina) | 3,870.21 mi (6,228.50 km) |
| Harpenden to Carroll (Iowa) | 4,188.53 mi (6,740.79 km) |
| Harpenden to Carrollton (Georgia) | 4,227.07 mi (6,802.81 km) |
| Harpenden to Carrollton (Texas) | 4,722.84 mi (7,600.68 km) |
| Harpenden to Carrollwood (Florida) | 4,396.63 mi (7,075.70 km) |
