| Rhondda to Cicero (Illinois) | 3,824.46 mi (6,154.87 km) |
| Rhondda to Cimarron Hills (Colorado) | 4,601.32 mi (7,405.10 km) |
| Rhondda to Cincinnati (Ohio) | 3,820.25 mi (6,148.10 km) |
| Rhondda to Cinco Ranch (Texas) | 4,731.62 mi (7,614.81 km) |
| Rhondda to Circleville (Ohio) | 3,736.00 mi (6,012.51 km) |
| Rhondda to Citrus (California) | 5,313.09 mi (8,550.59 km) |
| Rhondda to Citrus Heights (California) | 5,162.80 mi (8,308.73 km) |
| Rhondda to Citrus Park (Florida) | 4,272.17 mi (6,875.39 km) |
| Rhondda to Claiborne (Louisiana) | 4,446.70 mi (7,156.27 km) |
| Rhondda to Claremont (California) | 5,306.76 mi (8,540.40 km) |
| Rhondda to Claremont (New Hampshire) | 3,144.89 mi (5,061.21 km) |
| Rhondda to Claremore (Oklahoma) | 4,392.35 mi (7,068.81 km) |
| Rhondda to Clarksburg (Maryland) | 3,522.86 mi (5,669.50 km) |
| Rhondda to Clarksburg (West Virginia) | 3,645.04 mi (5,866.12 km) |
| Rhondda to Clarksdale (Mississippi) | 4,299.14 mi (6,918.80 km) |
