| Merthyr Tudful to Cividale del Friuli | 854.31 mi (1,374.88 km) |
| Merthyr Tudful to Civita Castellana | 985.72 mi (1,586.36 km) |
| Merthyr Tudful to Civitanova Marche | 984.83 mi (1,584.93 km) |
| Merthyr Tudful to Civitavecchia | 974.66 mi (1,568.57 km) |
| Merthyr Tudful to Civitella in Val di Chiana | 905.73 mi (1,457.63 km) |
| Merthyr Tudful to Clusone | 727.42 mi (1,170.66 km) |
| Merthyr Tudful to Coccaglio | 742.47 mi (1,194.89 km) |
| Merthyr Tudful to Codigoro | 854.81 mi (1,375.68 km) |
| Merthyr Tudful to Codogno | 750.70 mi (1,208.14 km) |
| Merthyr Tudful to Codroipo | 841.48 mi (1,354.23 km) |
| Merthyr Tudful to Cogoleto | 750.84 mi (1,208.36 km) |
| Merthyr Tudful to Colle di Val d'Elsa | 885.90 mi (1,425.72 km) |
| Merthyr Tudful to Colle Salvetti | 853.30 mi (1,373.25 km) |
| Merthyr Tudful to Collecchio | 788.27 mi (1,268.60 km) |
| Merthyr Tudful to Colleferro | 1,035.41 mi (1,666.33 km) |
