| ZIP | Locality | Prov | Region | Area Code | Belfiore | Notes | Locality | area code |
|---|---|---|---|---|---|---|---|---|
| 03030 | Casalattico | FR | Lazio | 0776 | B862 | Casalattico FR - Lazio | 0776 | |
| 03034 | Casalvieri | FR | Lazio | 0776 | B919 | Casalvieri FR - Lazio | 0776 | |
| 03043 | Cassino | FR | Lazio | 0776 | C034 | Cassino FR - Lazio | 0776 | |
| 03030 | Castelliri | FR | Lazio | 0776 | C177 | Castelliri FR - Lazio | 0776 | |
| 03040 | Castelnuovo Parano | FR | Lazio | 0776 | C223 | Castelnuovo Parano FR - Lazio | 0776 | |
| 03030 | Castrocielo | FR | Lazio | 0776 | C340 | Castrocielo FR - Lazio | 0776 | |
| 03044 | Cervaro | FR | Lazio | 0776 | C545 | Cervaro FR - Lazio | 0776 | |
| 03030 | Colfelice | FR | Lazio | 0776 | C836 | Colfelice FR - Lazio | 0776 | |
| 03030 | Colle San Magno | FR | Lazio | 0776 | C870 | Colle San Magno FR - Lazio | 0776 | |
| 03040 | Coreno Ausonio | FR | Lazio | 0776 | C998 | Coreno Ausonio FR - Lazio | 0776 |