| Rhondda to Jacksonville (Texas) | 4,597.86 mi (7,399.55 km) |
| Rhondda to Jacksonville Beach (Florida) | 4,114.30 mi (6,621.32 km) |
| Rhondda to James Island (South Carolina) | 3,933.69 mi (6,330.66 km) |
| Rhondda to Jamestown (New York) | 3,477.43 mi (5,596.39 km) |
| Rhondda to Jamestown (North Dakota) | 3,991.15 mi (6,423.13 km) |
| Rhondda to Janesville (Wisconsin) | 3,834.28 mi (6,170.68 km) |
| Rhondda to Jasmine Estates (Florida) | 4,266.59 mi (6,866.42 km) |
| Rhondda to Jasper (Alabama) | 4,182.74 mi (6,731.47 km) |
| Rhondda to Jasper (Indiana) | 3,952.06 mi (6,360.22 km) |
| Rhondda to Jefferson (Georgia) | 4,018.69 mi (6,467.45 km) |
| Rhondda to Jefferson (Louisiana) | 4,493.41 mi (7,231.45 km) |
| Rhondda to Jefferson City (Missouri) | 4,149.20 mi (6,677.50 km) |
| Rhondda to Jefferson Hills (Pennsylvania) | 3,584.32 mi (5,768.40 km) |
| Rhondda to Jefferson Valley-Yorktown (New York) | 3,289.90 mi (5,294.58 km) |
| Rhondda to Jeffersontown (Kentucky) | 3,906.22 mi (6,286.45 km) |
