| Rhondda to Jeffersonville (Indiana) | 3,905.33 mi (6,285.02 km) |
| Rhondda to Jenison (Michigan) | 3,701.85 mi (5,957.55 km) |
| Rhondda to Jenks (Oklahoma) | 4,422.20 mi (7,116.84 km) |
| Rhondda to Jennings (Missouri) | 4,067.44 mi (6,545.92 km) |
| Rhondda to Jensen Beach (Florida) | 4,215.35 mi (6,783.96 km) |
| Rhondda to Jericho (New York) | 3,301.69 mi (5,313.56 km) |
| Rhondda to Jerome (Idaho) | 4,728.44 mi (7,609.68 km) |
| Rhondda to Jersey City (New Jersey) | 3,326.36 mi (5,353.26 km) |
| Rhondda to Jessup (Maryland) | 3,506.12 mi (5,642.55 km) |
| Rhondda to Johns Creek (Georgia) | 4,048.40 mi (6,515.26 km) |
| Rhondda to Johnson City (New York) | 3,344.24 mi (5,382.03 km) |
| Rhondda to Johnson City (Tennessee) | 3,864.13 mi (6,218.72 km) |
| Rhondda to Johnston (Iowa) | 4,058.72 mi (6,531.88 km) |
| Rhondda to Johnstown (Colorado) | 4,533.30 mi (7,295.64 km) |
| Rhondda to Johnstown (Pennsylvania) | 3,541.77 mi (5,699.93 km) |
