| Formia to Cartagena | 818.02 mi (1,316.48 km) |
| Formia to Cartama | 1,026.95 mi (1,652.72 km) |
| Formia to Cartaya | 1,141.29 mi (1,836.72 km) |
| Formia to Caspe | 708.35 mi (1,139.98 km) |
| Formia to Cassa de la Selva | 556.53 mi (895.65 km) |
| Formia to Castalla | 778.13 mi (1,252.28 km) |
| Formia to Castellbisbal | 602.97 mi (970.39 km) |
| Formia to Castelldefels | 604.00 mi (972.04 km) |
| Formia to Castello de Ampurias | 547.25 mi (880.71 km) |
| Formia to Castellon de la Plana | 720.52 mi (1,159.57 km) |
| Formia to Castilleja de la Cuesta | 1,082.24 mi (1,741.70 km) |
| Formia to Catarroja | 748.75 mi (1,204.99 km) |
| Formia to Catral | 794.94 mi (1,279.33 km) |
| Formia to Caudete | 792.14 mi (1,274.83 km) |
| Formia to Cehegin | 847.28 mi (1,363.57 km) |
