| Harpenden to Cicero (Illinois) | 3,935.60 mi (6,333.74 km) |
| Harpenden to Cimarron Hills (Colorado) | 4,701.37 mi (7,566.12 km) |
| Harpenden to Cincinnati (Ohio) | 3,936.53 mi (6,335.24 km) |
| Harpenden to Cinco Ranch (Texas) | 4,847.84 mi (7,801.85 km) |
| Harpenden to Circleville (Ohio) | 3,852.89 mi (6,200.63 km) |
| Harpenden to Citrus (California) | 5,404.04 mi (8,696.96 km) |
| Harpenden to Citrus Heights (California) | 5,245.11 mi (8,441.19 km) |
| Harpenden to Citrus Park (Florida) | 4,397.86 mi (7,077.68 km) |
| Harpenden to Claiborne (Louisiana) | 4,563.37 mi (7,344.03 km) |
| Harpenden to Claremont (California) | 5,397.90 mi (8,687.08 km) |
| Harpenden to Claremont (New Hampshire) | 3,264.50 mi (5,253.70 km) |
| Harpenden to Claremore (Oklahoma) | 4,503.05 mi (7,246.96 km) |
| Harpenden to Clarksburg (Maryland) | 3,643.68 mi (5,863.93 km) |
| Harpenden to Clarksburg (West Virginia) | 3,763.93 mi (6,057.46 km) |
| Harpenden to Clarksdale (Mississippi) | 4,415.62 mi (7,106.26 km) |
