| Rhondda to Joliet (Illinois) | 3,854.46 mi (6,203.16 km) |
| Rhondda to Jonesboro (Arkansas) | 4,223.70 mi (6,797.39 km) |
| Rhondda to Joplin (Missouri) | 4,311.88 mi (6,939.30 km) |
| Rhondda to Joppatowne (Maryland) | 3,476.72 mi (5,595.24 km) |
| Rhondda to Juana Díaz (Puerto Rico) | 4,099.09 mi (6,596.84 km) |
| Rhondda to Junction City (Kansas) | 4,305.10 mi (6,928.39 km) |
| Rhondda to Juneau (Alaska) | 4,344.16 mi (6,991.25 km) |
| Rhondda to Jupiter (Florida) | 4,226.03 mi (6,801.14 km) |
| Rhondda to Jupiter Farms (Florida) | 4,230.43 mi (6,808.22 km) |
| Rhondda to Jurupa Valley (California) | 5,305.63 mi (8,538.58 km) |
| Rhondda to Justice (Illinois) | 3,831.70 mi (6,166.53 km) |
| Rhondda to Kahului (Hawaii) | 7,169.20 mi (11,537.72 km) |
| Rhondda to Kailua (Hawaii) | 7,158.07 mi (11,519.81 km) |
| Rhondda to Kalamazoo (Michigan) | 3,720.76 mi (5,987.99 km) |
| Rhondda to Kalispell (Montana) | 4,428.77 mi (7,127.42 km) |
