| Merthyr Tudful to Carpentras | 658.22 mi (1,059.31 km) |
| Merthyr Tudful to Carquefou | 318.59 mi (512.72 km) |
| Merthyr Tudful to Carqueiranne | 741.85 mi (1,193.90 km) |
| Merthyr Tudful to Carrieres-sous-Poissy | 307.01 mi (494.08 km) |
| Merthyr Tudful to Carrieres-sur-Seine | 317.30 mi (510.64 km) |
| Merthyr Tudful to Carros | 736.35 mi (1,185.04 km) |
| Merthyr Tudful to Carvin | 287.94 mi (463.40 km) |
| Merthyr Tudful to Castanet-Tolosan | 611.78 mi (984.56 km) |
| Merthyr Tudful to Castelginest | 599.10 mi (964.16 km) |
| Merthyr Tudful to Castelnau-le-Lez | 653.73 mi (1,052.07 km) |
| Merthyr Tudful to Castelnaudary | 632.60 mi (1,018.07 km) |
| Merthyr Tudful to Castelsarrasin | 571.07 mi (919.05 km) |
| Merthyr Tudful to Castres | 620.12 mi (997.99 km) |
| Merthyr Tudful to Caudebec-les-Elbeuf | 257.41 mi (414.26 km) |
| Merthyr Tudful to Caudry | 315.93 mi (508.44 km) |
