| Merthyr Tudful to Culpeper (Virginia) | 3,585.80 mi (5,770.80 km) |
| Merthyr Tudful to Culver City (California) | 5,331.82 mi (8,580.74 km) |
| Merthyr Tudful to Cumberland (Maryland) | 3,563.92 mi (5,735.57 km) |
| Merthyr Tudful to Cupertino (California) | 5,259.80 mi (8,464.83 km) |
| Merthyr Tudful to Cutler Bay (Florida) | 4,303.62 mi (6,926.00 km) |
| Merthyr Tudful to Cutlerville (Michigan) | 3,696.61 mi (5,949.11 km) |
| Merthyr Tudful to Cuyahoga Falls (Ohio) | 3,608.01 mi (5,806.52 km) |
| Merthyr Tudful to Cypress (California) | 5,330.64 mi (8,578.83 km) |
| Merthyr Tudful to Cypress Gardens (Florida) | 4,238.76 mi (6,821.63 km) |
| Merthyr Tudful to Cypress Lake (Florida) | 4,321.29 mi (6,954.45 km) |
| Merthyr Tudful to D'Iberville (Mississippi) | 4,415.44 mi (7,105.97 km) |
| Merthyr Tudful to Dakota Ridge (Colorado) | 4,573.94 mi (7,361.05 km) |
| Merthyr Tudful to Dale City (Virginia) | 3,551.00 mi (5,714.78 km) |
| Merthyr Tudful to Dallas (Georgia) | 4,079.40 mi (6,565.16 km) |
| Merthyr Tudful to Dallas (Oregon) | 4,863.08 mi (7,826.37 km) |
