| Key West to Jacksonville (North Carolina) | 749.77 mi (1,206.64 km) |
| Key West to Jacksonville (Texas) | 965.57 mi (1,553.94 km) |
| Key West to Jacksonville Beach (Florida) | 395.46 mi (636.43 km) |
| Key West to James Island (South Carolina) | 575.43 mi (926.06 km) |
| Key West to Jamestown (New York) | 1,220.13 mi (1,963.61 km) |
| Key West to Jamestown (North Dakota) | 1,803.18 mi (2,901.93 km) |
| Key West to Janesville (Wisconsin) | 1,318.14 mi (2,121.34 km) |
| Key West to Jasmine Estates (Florida) | 263.75 mi (424.47 km) |
| Key West to Jasper (Alabama) | 721.79 mi (1,161.61 km) |
| Key West to Jasper (Indiana) | 1,002.27 mi (1,613.00 km) |
| Key West to Jefferson (Georgia) | 670.46 mi (1,079.00 km) |
| Key West to Jefferson (Louisiana) | 635.10 mi (1,022.10 km) |
| Key West to Jefferson City (Missouri) | 1,143.06 mi (1,839.58 km) |
| Key West to Jefferson Hills (Pennsylvania) | 1,091.96 mi (1,757.35 km) |
| Key West to Jefferson Valley-Yorktown (New York) | 1,245.13 mi (2,003.85 km) |
