| Formia to Cividale del Friuli | 334.07 mi (537.64 km) |
| Formia to Civita Castellana | 94.47 mi (152.03 km) |
| Formia to Civitanova Marche | 140.61 mi (226.30 km) |
| Formia to Civitavecchia | 110.01 mi (177.04 km) |
| Formia to Civitella in Val di Chiana | 177.42 mi (285.53 km) |
| Formia to Clusone | 367.91 mi (592.10 km) |
| Formia to Coccaglio | 348.44 mi (560.76 km) |
| Formia to Codigoro | 257.79 mi (414.87 km) |
| Formia to Codogno | 333.32 mi (536.42 km) |
| Formia to Codroipo | 326.01 mi (524.66 km) |
| Formia to Cogoleto | 331.54 mi (533.56 km) |
| Formia to Colle di Val d'Elsa | 194.44 mi (312.92 km) |
| Formia to Colle Salvetti | 226.95 mi (365.24 km) |
| Formia to Collecchio | 295.63 mi (475.77 km) |
| Formia to Colleferro | 44.76 mi (72.03 km) |
