| Llantwit Major to Jacksonville (Texas) | 4,601.11 mi (7,404.78 km) |
| Llantwit Major to Jacksonville Beach (Florida) | 4,114.78 mi (6,622.10 km) |
| Llantwit Major to James Island (South Carolina) | 3,934.43 mi (6,331.86 km) |
| Llantwit Major to Jamestown (New York) | 3,480.29 mi (5,600.99 km) |
| Llantwit Major to Jamestown (North Dakota) | 3,997.78 mi (6,433.80 km) |
| Llantwit Major to Janesville (Wisconsin) | 3,838.72 mi (6,177.82 km) |
| Llantwit Major to Jasmine Estates (Florida) | 4,266.90 mi (6,866.91 km) |
| Llantwit Major to Jasper (Alabama) | 4,185.00 mi (6,735.11 km) |
| Llantwit Major to Jasper (Indiana) | 3,955.23 mi (6,365.33 km) |
| Llantwit Major to Jefferson (Georgia) | 4,020.38 mi (6,470.18 km) |
| Llantwit Major to Jefferson (Louisiana) | 4,495.40 mi (7,234.64 km) |
| Llantwit Major to Jefferson City (Missouri) | 4,153.23 mi (6,683.98 km) |
| Llantwit Major to Jefferson Hills (Pennsylvania) | 3,586.83 mi (5,772.44 km) |
| Llantwit Major to Jefferson Valley-Yorktown (New York) | 3,291.71 mi (5,297.50 km) |
| Llantwit Major to Jeffersontown (Kentucky) | 3,909.13 mi (6,291.14 km) |
