| Harpenden to Centralia (Illinois) | 4,145.87 mi (6,672.13 km) |
| Harpenden to Centralia (Washington) | 4,828.83 mi (7,771.25 km) |
| Harpenden to Centreville (Virginia) | 3,668.16 mi (5,903.33 km) |
| Harpenden to Ceres (California) | 5,299.05 mi (8,527.99 km) |
| Harpenden to Cerritos (California) | 5,424.00 mi (8,729.09 km) |
| Harpenden to Chalco (Nebraska) | 4,278.31 mi (6,885.27 km) |
| Harpenden to Chalmette (Louisiana) | 4,606.70 mi (7,413.78 km) |
| Harpenden to Chambersburg (Pennsylvania) | 3,627.58 mi (5,838.02 km) |
| Harpenden to Chamblee (Georgia) | 4,180.54 mi (6,727.93 km) |
| Harpenden to Champaign (Illinois) | 4,036.81 mi (6,496.61 km) |
| Harpenden to Champlin (Minnesota) | 3,986.60 mi (6,415.81 km) |
| Harpenden to Chandler (Arizona) | 5,250.91 mi (8,450.52 km) |
| Harpenden to Chanhassen (Minnesota) | 4,007.64 mi (6,449.68 km) |
| Harpenden to Channahon (Illinois) | 3,974.45 mi (6,396.25 km) |
| Harpenden to Channelview (Texas) | 4,819.73 mi (7,756.60 km) |
