There are 48 comuni (singular: comune) in the province, see Comuni of the Province of Piacenza. As of May 31, 2005, the main comuni by population are:
| Comune | Population |
|---|---|
| Piacenza | 99,402 |
| Fiorenzuola d'Arda | 13,976 |
| Castel San Giovanni | 12,743 |
| Rottofreno | 9,849 |
| Podenzano | 8,107 |
| Carpaneto Piacentino | 7,247 |
| Borgonovo Val Tidone | 7,063 |
| Rivergaro | 6,159 |
| Pontenure | 5,616 |
| Cadeo | 5,582 |
| San Giorgio Piacentino | 5,526 |
| Monticelli d'Ongina | 5,310 |
| Castelvetro Piacentino | 5,155 |
Read more about this topic: Province Of Piacenza