| Aberconwy and Colwyn County Borough Council | The area of the new authority. |
| Anglesey County Council | The area of the new authority. |
| Caernarfonshire and Merionethshire County Council | The area of the new authority. |
| Cardiganshire County Council | The area of the new authority. |
| Carmarthenshire County Council | The area of the new authority. |
| Denbighshire County Council | The area of the new authority. |
| Flintshire County Council | The area of the new authority. |
| Monmouthshire County Council | The area of the new authority together with the areas of Blaenau Gwent, Caerphilly, Newport and Torfaen County Borough Councils. |
| Neath and Port Talbot County Borough Council | The area of the new authority. |
| Pembrokeshire County Council | The area of the new authority. |
| Powys County Council | The area of the new authority. |
| Rhondda, Cynon, Taff County Borough Council | The area of the new authority together with the areas of Bridgend and Merthyr Tydfil County Borough Councils. |
| Swansea County Council | The area of the new authority. |
| The Vale of Glamorgan County Borough Council | The area of the new authority together with the area of Cardiff County Council. |
| Wrexham County Borough Council | The area of the new authority. |