| Hemel Hempstead to Joliet (Illinois) | 3,963.30 mi (6,378.31 km) |
| Hemel Hempstead to Jonesboro (Arkansas) | 4,335.98 mi (6,978.08 km) |
| Hemel Hempstead to Joplin (Missouri) | 4,420.40 mi (7,113.95 km) |
| Hemel Hempstead to Joppatowne (Maryland) | 3,594.55 mi (5,784.87 km) |
| Hemel Hempstead to Juana Díaz (Puerto Rico) | 4,225.38 mi (6,800.10 km) |
| Hemel Hempstead to Junction City (Kansas) | 4,410.05 mi (7,097.29 km) |
| Hemel Hempstead to Juneau (Alaska) | 4,390.46 mi (7,065.76 km) |
| Hemel Hempstead to Jupiter (Florida) | 4,349.32 mi (6,999.55 km) |
| Hemel Hempstead to Jupiter Farms (Florida) | 4,353.68 mi (7,006.57 km) |
| Hemel Hempstead to Jurupa Valley (California) | 5,396.35 mi (8,684.58 km) |
| Hemel Hempstead to Justice (Illinois) | 3,940.52 mi (6,341.66 km) |
| Hemel Hempstead to Kahului (Hawaii) | 7,212.95 mi (11,608.12 km) |
| Hemel Hempstead to Kailua (Hawaii) | 7,199.05 mi (11,585.76 km) |
| Hemel Hempstead to Kalamazoo (Michigan) | 3,830.54 mi (6,164.66 km) |
| Hemel Hempstead to Kalispell (Montana) | 4,507.94 mi (7,254.83 km) |
