| Rhondda to Clarkston (Georgia) | 4,060.61 mi (6,534.92 km) |
| Rhondda to Clarksville (Indiana) | 3,908.64 mi (6,290.35 km) |
| Rhondda to Clarksville (Tennessee) | 4,054.43 mi (6,524.98 km) |
| Rhondda to Clawson (Michigan) | 3,613.76 mi (5,815.79 km) |
| Rhondda to Clay (Alabama) | 4,163.34 mi (6,700.25 km) |
| Rhondda to Clayton (California) | 5,225.48 mi (8,409.59 km) |
| Rhondda to Clayton (Missouri) | 4,073.77 mi (6,556.09 km) |
| Rhondda to Clayton (North Carolina) | 3,733.59 mi (6,008.63 km) |
| Rhondda to Clayton (Ohio) | 3,779.87 mi (6,083.11 km) |
| Rhondda to Clearfield (Utah) | 4,734.86 mi (7,620.02 km) |
| Rhondda to Clearlake (California) | 5,188.65 mi (8,350.32 km) |
| Rhondda to Clearwater (Florida) | 4,285.28 mi (6,896.48 km) |
| Rhondda to Cleburne (Texas) | 4,662.65 mi (7,503.82 km) |
| Rhondda to Clemmons (North Carolina) | 3,796.52 mi (6,109.91 km) |
| Rhondda to Clemson (South Carolina) | 3,960.06 mi (6,373.10 km) |
