| Rhondda to Castle Rock (Colorado) | 4,580.11 mi (7,370.98 km) |
| Rhondda to Castro Valley (California) | 5,242.77 mi (8,437.43 km) |
| Rhondda to Catalina Foothills (Arizona) | 5,171.45 mi (8,322.65 km) |
| Rhondda to Cataño (Puerto Rico) | 4,063.54 mi (6,539.64 km) |
| Rhondda to Cathedral City (California) | 5,281.10 mi (8,499.11 km) |
| Rhondda to Catonsville (Maryland) | 3,499.57 mi (5,632.01 km) |
| Rhondda to Cave Spring (Virginia) | 3,725.73 mi (5,995.99 km) |
| Rhondda to Cayce (South Carolina) | 3,921.93 mi (6,311.74 km) |
| Rhondda to Cayey (Puerto Rico) | 4,081.39 mi (6,568.36 km) |
| Rhondda to Cedar City (Utah) | 4,955.20 mi (7,974.62 km) |
| Rhondda to Cedar Falls (Iowa) | 3,972.08 mi (6,392.44 km) |
| Rhondda to Cedar Hill (Texas) | 4,633.32 mi (7,456.61 km) |
| Rhondda to Cedar Lake (Indiana) | 3,833.73 mi (6,169.80 km) |
| Rhondda to Cedar Mill (Oregon) | 4,819.62 mi (7,756.43 km) |
| Rhondda to Cedar Park (Texas) | 4,773.64 mi (7,682.44 km) |
