| Merthyr Tudful to Corinth (Mississippi) | 4,178.26 mi (6,724.27 km) |
| Merthyr Tudful to Corinth (Texas) | 4,606.77 mi (7,413.88 km) |
| Merthyr Tudful to Cornelius (North Carolina) | 3,842.40 mi (6,183.74 km) |
| Merthyr Tudful to Cornelius (Oregon) | 4,821.96 mi (7,760.19 km) |
| Merthyr Tudful to Corning (New York) | 3,386.18 mi (5,449.54 km) |
| Merthyr Tudful to Corona (California) | 5,312.40 mi (8,549.48 km) |
| Merthyr Tudful to Coronado (California) | 5,366.21 mi (8,636.07 km) |
| Merthyr Tudful to Corpus Christi (Texas) | 4,899.21 mi (7,884.51 km) |
| Merthyr Tudful to Corsicana (Texas) | 4,637.53 mi (7,463.38 km) |
| Merthyr Tudful to Cortland (New York) | 3,331.58 mi (5,361.67 km) |
| Merthyr Tudful to Corvallis (Oregon) | 4,882.11 mi (7,857.00 km) |
| Merthyr Tudful to Coshocton (Ohio) | 3,661.37 mi (5,892.41 km) |
| Merthyr Tudful to Costa Mesa (California) | 5,334.97 mi (8,585.81 km) |
| Merthyr Tudful to Coto de Caza (California) | 5,328.06 mi (8,574.69 km) |
| Merthyr Tudful to Cottage Grove (Minnesota) | 3,880.07 mi (6,244.38 km) |
