| Mountain Ash to Jacksonville (Texas) | 4,597.65 mi (7,399.21 km) |
| Mountain Ash to Jacksonville Beach (Florida) | 4,115.00 mi (6,622.46 km) |
| Mountain Ash to James Island (South Carolina) | 3,934.31 mi (6,331.66 km) |
| Mountain Ash to Jamestown (New York) | 3,477.36 mi (5,596.27 km) |
| Mountain Ash to Jamestown (North Dakota) | 3,989.78 mi (6,420.93 km) |
| Mountain Ash to Janesville (Wisconsin) | 3,833.67 mi (6,169.70 km) |
| Mountain Ash to Jasmine Estates (Florida) | 4,267.35 mi (6,867.64 km) |
| Mountain Ash to Jasper (Alabama) | 4,182.86 mi (6,731.67 km) |
| Mountain Ash to Jasper (Indiana) | 3,951.88 mi (6,359.93 km) |
| Mountain Ash to Jefferson (Georgia) | 4,019.00 mi (6,467.95 km) |
| Mountain Ash to Jefferson (Louisiana) | 4,493.62 mi (7,231.79 km) |
| Mountain Ash to Jefferson City (Missouri) | 4,148.73 mi (6,676.74 km) |
| Mountain Ash to Jefferson Hills (Pennsylvania) | 3,584.36 mi (5,768.47 km) |
| Mountain Ash to Jefferson Valley-Yorktown (New York) | 3,290.17 mi (5,295.02 km) |
| Mountain Ash to Jeffersontown (Kentucky) | 3,906.12 mi (6,286.30 km) |
