| Harpenden to Cloverly (Maryland) | 3,638.22 mi (5,855.15 km) |
| Harpenden to Clovis (California) | 5,304.60 mi (8,536.93 km) |
| Harpenden to Clovis (New Mexico) | 4,881.95 mi (7,856.74 km) |
| Harpenden to Clute (Texas) | 4,870.87 mi (7,838.91 km) |
| Harpenden to Coachella (California) | 5,371.74 mi (8,644.99 km) |
| Harpenden to Coalinga (California) | 5,363.77 mi (8,632.15 km) |
| Harpenden to Coamo (Puerto Rico) | 4,223.72 mi (6,797.42 km) |
| Harpenden to Coatesville (Pennsylvania) | 3,551.02 mi (5,714.82 km) |
| Harpenden to Cockeysville (Maryland) | 3,606.37 mi (5,803.89 km) |
| Harpenden to Cocoa (Florida) | 4,307.37 mi (6,932.04 km) |
| Harpenden to Cocoa Beach (Florida) | 4,303.98 mi (6,926.58 km) |
| Harpenden to Coconut Creek (Florida) | 4,388.82 mi (7,063.12 km) |
| Harpenden to Coeur d'Alene (Idaho) | 4,605.77 mi (7,412.28 km) |
| Harpenden to Cohoes (New York) | 3,344.91 mi (5,383.11 km) |
| Harpenden to Cold Springs (Nevada) | 5,148.88 mi (8,286.33 km) |
