| Merthyr Tudful to Cehegin | 946.26 mi (1,522.85 km) |
| Merthyr Tudful to Cervello | 757.99 mi (1,219.87 km) |
| Merthyr Tudful to Cervera | 729.90 mi (1,174.66 km) |
| Merthyr Tudful to Ceuti | 949.60 mi (1,528.23 km) |
| Merthyr Tudful to Cheste | 857.10 mi (1,379.37 km) |
| Merthyr Tudful to Chiclana de la Frontera | 1,067.64 mi (1,718.20 km) |
| Merthyr Tudful to Chipiona | 1,047.80 mi (1,686.27 km) |
| Merthyr Tudful to Chiva | 857.41 mi (1,379.87 km) |
| Merthyr Tudful to Churriana de la Vega | 1,008.37 mi (1,622.81 km) |
| Merthyr Tudful to Ciempozuelos | 800.45 mi (1,288.19 km) |
| Merthyr Tudful to Cieza | 937.83 mi (1,509.29 km) |
| Merthyr Tudful to Cisterniga | 702.36 mi (1,130.34 km) |
| Merthyr Tudful to Ciudad de Melilla | 1,137.51 mi (1,830.64 km) |
| Merthyr Tudful to Ciudad Real | 881.99 mi (1,419.43 km) |
| Merthyr Tudful to Ciudad-Rodrigo | 784.64 mi (1,262.75 km) |
