| Rhondda to Cloverly (Maryland) | 3,517.14 mi (5,660.30 km) |
| Rhondda to Clovis (California) | 5,218.46 mi (8,398.29 km) |
| Rhondda to Clovis (New Mexico) | 4,776.04 mi (7,686.29 km) |
| Rhondda to Clute (Texas) | 4,753.84 mi (7,650.56 km) |
| Rhondda to Coachella (California) | 5,278.38 mi (8,494.73 km) |
| Rhondda to Coalinga (California) | 5,277.70 mi (8,493.63 km) |
| Rhondda to Coamo (Puerto Rico) | 4,091.91 mi (6,585.29 km) |
| Rhondda to Coatesville (Pennsylvania) | 3,430.05 mi (5,520.13 km) |
| Rhondda to Cockeysville (Maryland) | 3,485.41 mi (5,609.22 km) |
| Rhondda to Cocoa (Florida) | 4,180.96 mi (6,728.61 km) |
| Rhondda to Cocoa Beach (Florida) | 4,177.48 mi (6,723.00 km) |
| Rhondda to Coconut Creek (Florida) | 4,261.13 mi (6,857.63 km) |
| Rhondda to Coeur d'Alene (Idaho) | 4,528.56 mi (7,288.01 km) |
| Rhondda to Cohoes (New York) | 3,225.45 mi (5,190.86 km) |
| Rhondda to Cold Springs (Nevada) | 5,066.06 mi (8,153.03 km) |
