| Hemel Hempstead to Caguas (Puerto Rico) | 4,196.21 mi (6,753.15 km) |
| Hemel Hempstead to Cahokia (Illinois) | 4,181.91 mi (6,730.14 km) |
| Hemel Hempstead to Calabasas (California) | 5,426.96 mi (8,733.84 km) |
| Hemel Hempstead to Caldwell (Idaho) | 4,826.81 mi (7,767.99 km) |
| Hemel Hempstead to Caledonia (Wisconsin) | 3,893.34 mi (6,265.73 km) |
| Hemel Hempstead to Calera (Alabama) | 4,313.43 mi (6,941.80 km) |
| Hemel Hempstead to Calexico (California) | 5,406.33 mi (8,700.65 km) |
| Hemel Hempstead to Calhoun (Georgia) | 4,173.44 mi (6,716.50 km) |
| Hemel Hempstead to California (Maryland) | 3,650.95 mi (5,875.63 km) |
| Hemel Hempstead to California City (California) | 5,343.19 mi (8,599.03 km) |
| Hemel Hempstead to Callaway (Florida) | 4,414.27 mi (7,104.08 km) |
| Hemel Hempstead to Calumet City (Illinois) | 3,936.07 mi (6,334.49 km) |
| Hemel Hempstead to Calverton (Maryland) | 3,635.01 mi (5,849.99 km) |
| Hemel Hempstead to Camano (Washington) | 4,732.43 mi (7,616.12 km) |
| Hemel Hempstead to Camarillo (California) | 5,433.58 mi (8,744.50 km) |
