This region has 4 departments.
| Code | Name | Administrative seat |
|---|---|---|
| 22 | Côtes-d'Armor | Saint-Brieuc |
| 29 | Finistère | Quimper |
| 35 | Ille-et-Vilaine | Rennes |
| 56 | Morbihan | Vannes |
This region has 111 cantons.
| Code | Name | Central office |
|---|---|---|
| 2201 | Bégard | Bégard |
| 2202 | Broons | Broons |
| 2203 | Callac | Callac |
| 2204 | Dinan | Dinan |
| 2205 | Guingamp | Guingamp |
This region has 15 arrondissements.
| Code | Name | Administrative seat |
|---|---|---|
| 221 | Dinan | Dinan |
| 222 | Guingamp | Guingamp |
| 223 | Lannion | Lannion |
| 224 | Saint-Brieuc | Saint-Brieuc |
| 291 | Brest | Brest |
This region has 4 departmental collectivities.