| Blackrock to Jacksonville (Texas) | 4,447.50 mi (7,157.56 km) |
| Blackrock to Jacksonville Beach (Florida) | 3,979.61 mi (6,404.57 km) |
| Blackrock to James Island (South Carolina) | 3,797.38 mi (6,111.29 km) |
| Blackrock to Jamestown (New York) | 3,329.27 mi (5,357.94 km) |
| Blackrock to Jamestown (North Dakota) | 3,829.06 mi (6,162.27 km) |
| Blackrock to Janesville (Wisconsin) | 3,678.95 mi (5,920.70 km) |
| Blackrock to Jasmine Estates (Florida) | 4,132.97 mi (6,651.37 km) |
| Blackrock to Jasper (Alabama) | 4,037.47 mi (6,497.68 km) |
| Blackrock to Jasper (Indiana) | 3,802.21 mi (6,119.07 km) |
| Blackrock to Jefferson (Georgia) | 3,876.62 mi (6,238.81 km) |
| Blackrock to Jefferson (Louisiana) | 4,349.54 mi (6,999.91 km) |
| Blackrock to Jefferson City (Missouri) | 3,995.47 mi (6,430.08 km) |
| Blackrock to Jefferson Hills (Pennsylvania) | 3,437.90 mi (5,532.77 km) |
| Blackrock to Jefferson Valley-Yorktown (New York) | 3,147.44 mi (5,065.31 km) |
| Blackrock to Jeffersontown (Kentucky) | 3,757.65 mi (6,047.35 km) |
