| Formia to Castelfidardo | 151.88 mi (244.42 km) |
| Formia to Castelfiorentino | 210.34 mi (338.51 km) |
| Formia to Castelfranco di Sopra | 193.72 mi (311.76 km) |
| Formia to Castelfranco di Sotto | 222.69 mi (358.38 km) |
| Formia to Castelfranco Emilia | 264.09 mi (425.01 km) |
| Formia to Castelfranco Veneto | 315.49 mi (507.74 km) |
| Formia to Castellabate | 97.70 mi (157.23 km) |
| Formia to Castellammare del Golfo | 227.28 mi (365.77 km) |
| Formia to Castellammare di Stabia | 59.92 mi (96.44 km) |
| Formia to Castellamonte | 410.80 mi (661.12 km) |
| Formia to Castellana Grotte | 186.78 mi (300.59 km) |
| Formia to Castellaneta | 178.51 mi (287.29 km) |
| Formia to Castellanza | 382.37 mi (615.37 km) |
| Formia to Castellarano | 269.30 mi (433.39 km) |
| Formia to Castelleone | 339.19 mi (545.87 km) |
