| Merthyr Tudful to Creutzwald | 475.91 mi (765.91 km) |
| Merthyr Tudful to Croissy-sur-Seine | 313.73 mi (504.90 km) |
| Merthyr Tudful to Croix | 291.90 mi (469.77 km) |
| Merthyr Tudful to Crosne | 332.08 mi (534.42 km) |
| Merthyr Tudful to Cuers | 733.55 mi (1,180.53 km) |
| Merthyr Tudful to Cugnaux | 607.72 mi (978.03 km) |
| Merthyr Tudful to Cusset | 495.92 mi (798.10 km) |
| Merthyr Tudful to Dammarie-le-Lys | 347.24 mi (558.83 km) |
| Merthyr Tudful to Dammartin-en-Goele | 325.00 mi (523.04 km) |
| Merthyr Tudful to Dardilly | 551.94 mi (888.27 km) |
| Merthyr Tudful to Darnetal | 254.24 mi (409.16 km) |
| Merthyr Tudful to Dax | 565.40 mi (909.92 km) |
| Merthyr Tudful to Decines-Charpieu | 560.17 mi (901.51 km) |
| Merthyr Tudful to Denain | 309.94 mi (498.80 km) |
| Merthyr Tudful to Deuil-la-Barre | 315.72 mi (508.10 km) |
