| Formia to Coin | 1,034.25 mi (1,664.47 km) |
| Formia to Colindres | 882.36 mi (1,420.02 km) |
| Formia to Collado-Villalba | 919.22 mi (1,479.34 km) |
| Formia to Colmenar Viejo | 906.39 mi (1,458.69 km) |
| Formia to Colmenarejo | 920.42 mi (1,481.27 km) |
| Formia to Conil de la Frontera | 1,113.19 mi (1,791.51 km) |
| Formia to Consuegra | 913.70 mi (1,470.46 km) |
| Formia to Corbera de Llobregat | 605.79 mi (974.93 km) |
| Formia to Cordoba | 1,005.11 mi (1,617.56 km) |
| Formia to Coria del Rio | 1,084.68 mi (1,745.62 km) |
| Formia to Crevillente | 793.03 mi (1,276.26 km) |
| Formia to Cuarte de Huerva | 752.37 mi (1,210.82 km) |
| Formia to Cubellas | 620.04 mi (997.86 km) |
| Formia to Cuellar | 928.61 mi (1,494.46 km) |
| Formia to Cuenca | 829.30 mi (1,334.63 km) |
