| Merthyr Tudful to Caño Martin Peña (Puerto Rico) | 4,063.11 mi (6,538.95 km) |
| Merthyr Tudful to Cañon City (Colorado) | 4,638.03 mi (7,464.19 km) |
| Merthyr Tudful to Canóvanas (Puerto Rico) | 4,060.06 mi (6,534.03 km) |
| Merthyr Tudful to Canton (Georgia) | 4,048.99 mi (6,516.22 km) |
| Merthyr Tudful to Canton (Illinois) | 3,969.51 mi (6,388.31 km) |
| Merthyr Tudful to Canton (Mississippi) | 4,355.12 mi (7,008.89 km) |
| Merthyr Tudful to Canton (Ohio) | 3,617.72 mi (5,822.16 km) |
| Merthyr Tudful to Canyon (Texas) | 4,696.84 mi (7,558.84 km) |
| Merthyr Tudful to Canyon Lake (California) | 5,312.04 mi (8,548.90 km) |
| Merthyr Tudful to Canyon Lake (Texas) | 4,822.09 mi (7,760.40 km) |
| Merthyr Tudful to Cape Coral (Florida) | 4,320.04 mi (6,952.44 km) |
| Merthyr Tudful to Cape Girardeau (Missouri) | 4,105.43 mi (6,607.05 km) |
| Merthyr Tudful to Carbondale (Illinois) | 4,072.45 mi (6,553.97 km) |
| Merthyr Tudful to Carlisle (Pennsylvania) | 3,476.34 mi (5,594.63 km) |
| Merthyr Tudful to Carlsbad (California) | 5,344.47 mi (8,601.10 km) |
