This department has 240 communes.
| Code | Name | Population |
|---|---|---|
| 53130 | Laval | 49 400 |
| 53062 | Château-Gontier-sur-Mayenne | 16 584 |
| 53147 | Mayenne | 12 883 |
| 53097 | Évron | 8 252 |
| 53201 | Saint-Berthevin | 7 479 |
This department has 19 cantons.
This department has 3 departmental arrondissements.
| Code | Name | Administrative seat |
|---|---|---|
| 531 | Château-Gontier | Château-Gontier-sur-Mayenne |
| 532 | Laval | Laval |
| 533 | Mayenne | Mayenne |