| Key West to Johnstown (Pennsylvania) | 1,101.53 mi (1,772.75 km) |
| Key West to Joliet (Illinois) | 1,227.28 mi (1,975.11 km) |
| Key West to Jonesboro (Arkansas) | 941.05 mi (1,514.47 km) |
| Key West to Joplin (Missouri) | 1,145.43 mi (1,843.40 km) |
| Key West to Joppatowne (Maryland) | 1,073.85 mi (1,728.19 km) |
| Key West to Juana Díaz (Puerto Rico) | 1,080.11 mi (1,738.27 km) |
| Key West to Junction City (Kansas) | 1,331.14 mi (2,142.26 km) |
| Key West to Juneau (Alaska) | 3,445.15 mi (5,544.43 km) |
| Key West to Jupiter (Florida) | 192.94 mi (310.50 km) |
| Key West to Jupiter Farms (Florida) | 189.61 mi (305.14 km) |
| Key West to Jurupa Valley (California) | 2,234.90 mi (3,596.72 km) |
| Key West to Justice (Illinois) | 1,237.13 mi (1,990.97 km) |
| Key West to Kahului (Hawaii) | 4,706.92 mi (7,575.06 km) |
| Key West to Kailua (Hawaii) | 4,773.06 mi (7,681.50 km) |
| Key West to Kalamazoo (Michigan) | 1,242.91 mi (2,000.26 km) |
