| Merthyr Tudful to Clermont (Florida) | 4,213.87 mi (6,781.56 km) |
| Merthyr Tudful to Cleveland (Mississippi) | 4,326.18 mi (6,962.32 km) |
| Merthyr Tudful to Cleveland (Ohio) | 3,600.54 mi (5,794.50 km) |
| Merthyr Tudful to Cleveland (Tennessee) | 4,019.62 mi (6,468.96 km) |
| Merthyr Tudful to Cleveland Heights (Ohio) | 3,594.34 mi (5,784.54 km) |
| Merthyr Tudful to Cliffside Park (New Jersey) | 3,317.78 mi (5,339.45 km) |
| Merthyr Tudful to Clifton (Colorado) | 4,718.40 mi (7,593.54 km) |
| Merthyr Tudful to Clifton (New Jersey) | 3,323.00 mi (5,347.85 km) |
| Merthyr Tudful to Clinton (Iowa) | 3,917.35 mi (6,304.36 km) |
| Merthyr Tudful to Clinton (Maryland) | 3,528.34 mi (5,678.31 km) |
| Merthyr Tudful to Clinton (Mississippi) | 4,379.72 mi (7,048.47 km) |
| Merthyr Tudful to Clinton (Utah) | 4,729.94 mi (7,612.11 km) |
| Merthyr Tudful to Clive (Iowa) | 4,062.35 mi (6,537.72 km) |
| Merthyr Tudful to Cloquet (Minnesota) | 3,777.52 mi (6,079.33 km) |
| Merthyr Tudful to Cloverleaf (Texas) | 4,704.02 mi (7,570.39 km) |
