| Key Largo to Johnstown (Pennsylvania) | 1,054.00 mi (1,696.24 km) |
| Key Largo to Joliet (Illinois) | 1,216.46 mi (1,957.70 km) |
| Key Largo to Jonesboro (Arkansas) | 958.01 mi (1,541.77 km) |
| Key Largo to Joplin (Missouri) | 1,170.79 mi (1,884.21 km) |
| Key Largo to Joppatowne (Maryland) | 1,015.50 mi (1,634.29 km) |
| Key Largo to Juana Díaz (Puerto Rico) | 1,017.31 mi (1,637.20 km) |
| Key Largo to Junction City (Kansas) | 1,355.58 mi (2,181.59 km) |
| Key Largo to Juneau (Alaska) | 3,459.61 mi (5,567.71 km) |
| Key Largo to Jupiter (Florida) | 125.58 mi (202.11 km) |
| Key Largo to Jupiter Farms (Florida) | 124.93 mi (201.06 km) |
| Key Largo to Jurupa Valley (California) | 2,296.46 mi (3,695.79 km) |
| Key Largo to Justice (Illinois) | 1,224.70 mi (1,970.96 km) |
| Key Largo to Kahului (Hawaii) | 4,780.74 mi (7,693.86 km) |
| Key Largo to Kailua (Hawaii) | 4,845.90 mi (7,798.73 km) |
| Key Largo to Kalamazoo (Michigan) | 1,221.26 mi (1,965.43 km) |
