| Merthyr Tudful to Coudekerque-Branche | 253.62 mi (408.16 km) |
| Merthyr Tudful to Coueron | 321.49 mi (517.39 km) |
| Merthyr Tudful to Coulommiers | 349.52 mi (562.50 km) |
| Merthyr Tudful to Courbevoic | 316.64 mi (509.58 km) |
| Merthyr Tudful to Courcouronnes | 335.17 mi (539.41 km) |
| Merthyr Tudful to Cournon-d'Auvergne | 511.08 mi (822.50 km) |
| Merthyr Tudful to Courrieres | 288.33 mi (464.02 km) |
| Merthyr Tudful to Coutras | 486.35 mi (782.71 km) |
| Merthyr Tudful to Couzeix | 456.34 mi (734.40 km) |
| Merthyr Tudful to Cran-Gevrier | 589.74 mi (949.10 km) |
| Merthyr Tudful to Craponne | 554.28 mi (892.03 km) |
| Merthyr Tudful to Creil | 309.41 mi (497.95 km) |
| Merthyr Tudful to Crepy-en-Valois | 325.26 mi (523.45 km) |
| Merthyr Tudful to Crest | 619.12 mi (996.38 km) |
| Merthyr Tudful to Creteil | 328.68 mi (528.96 km) |
