| Mackworth to Jacksonville (Texas) | 4,635.98 mi (7,460.89 km) |
| Mackworth to Jacksonville Beach (Florida) | 4,173.54 mi (6,716.66 km) |
| Mackworth to James Island (South Carolina) | 3,991.13 mi (6,423.10 km) |
| Mackworth to Jamestown (New York) | 3,519.35 mi (5,663.85 km) |
| Mackworth to Jamestown (North Dakota) | 4,000.81 mi (6,438.69 km) |
| Mackworth to Janesville (Wisconsin) | 3,863.22 mi (6,217.25 km) |
| Mackworth to Jasmine Estates (Florida) | 4,326.98 mi (6,963.60 km) |
| Mackworth to Jasper (Alabama) | 4,228.82 mi (6,805.62 km) |
| Mackworth to Jasper (Indiana) | 3,991.17 mi (6,423.17 km) |
| Mackworth to Jefferson (Georgia) | 4,069.14 mi (6,548.65 km) |
| Mackworth to Jefferson (Louisiana) | 4,541.40 mi (7,308.67 km) |
| Mackworth to Jefferson City (Missouri) | 4,181.29 mi (6,729.13 km) |
| Mackworth to Jefferson Hills (Pennsylvania) | 3,628.85 mi (5,840.07 km) |
| Mackworth to Jefferson Valley-Yorktown (New York) | 3,339.94 mi (5,375.12 km) |
| Mackworth to Jeffersontown (Kentucky) | 3,947.41 mi (6,352.74 km) |
