| Holyhead to Cocentaina | 1,025.72 mi (1,650.74 km) |
| Holyhead to Coin | 1,149.89 mi (1,850.56 km) |
| Holyhead to Colindres | 687.00 mi (1,105.63 km) |
| Holyhead to Collado-Villalba | 876.29 mi (1,410.26 km) |
| Holyhead to Colmenar Viejo | 874.98 mi (1,408.14 km) |
| Holyhead to Colmenarejo | 881.29 mi (1,418.29 km) |
| Holyhead to Conil de la Frontera | 1,179.59 mi (1,898.37 km) |
| Holyhead to Consuegra | 957.97 mi (1,541.70 km) |
| Holyhead to Corbera de Llobregat | 876.31 mi (1,410.28 km) |
| Holyhead to Cordoba | 1,065.75 mi (1,715.16 km) |
| Holyhead to Coria del Rio | 1,109.35 mi (1,785.33 km) |
| Holyhead to Crevillente | 1,056.37 mi (1,700.07 km) |
| Holyhead to Cuarte de Huerva | 828.27 mi (1,332.98 km) |
| Holyhead to Cubellas | 885.87 mi (1,425.67 km) |
| Holyhead to Cuellar | 822.90 mi (1,324.34 km) |
