| The counties of Monmouthshire, Newport and Powys and the county boroughs of Blaenau Gwent, Caerphilly, and Torfaen | East Wales Valuation Tribunal Tribiwnlys Prisio Dwyrain Cymru | 66 | Blaenau Gwent County Borough Council | 9 |
| | | Caerphilly County Borough Council | 9 |
| | | Monmouthshire County Council | 9 |
| | | Newport City Council | 9 |
| | | Powys County Council | 21 |
| | | Torfaen County Borough Council | 9 |
| The counties of Anglesey, Gwynedd, Denbighshire and Flintshire and the county boroughs of Conwy and Wrexham | North Wales Valuation Tribunal Tribiwnlys Prisio Gogledd Cymru | 54 | Conwy County Borough Council | 9 |
| | | Isle of Anglesey County Council | 9 |
| | | Gwynedd County Council | 9 |
| | | Denbighshire County Council | 9 |
| | | Flintshire County Council | 9 |
| | | Wrexham County Borough Council | 9 |
| The county of Cardiff and the county boroughs of Bridgend, Merthyr Tydfil, Rhondda Cynon Taf and the Vale of Glamorgan | South Wales Valuation Tribunal Tribiwnlys Prisio De Cymru | 57 | Bridgend County Borough Council | 9 |
| | | County Council of the City and County of Cardiff | 18 |
| | | Merthyr Tydfil County Borough Council | 6 |
| | | Rhondda Cynon Taf County Borough Council | 15 |
| | | The Vale of Glamorgan County Borough Council | 9 |
| The counties of Ceredigion, Carmarthenshire, Pembrokeshire and Swansea and the county borough of Neath and Port Talbot | West Wales Valuation Tribunal Tribiwnlys Prisio Gorllewin Cymru | 57 | Ceredigion County Council | 6 |
| | | Carmarthenshire County Council | 12 |
| | | Neath and Port Talbot County Borough Council Pembrokeshire County Council | 12 12 |
| | | City and County of Swansea | 15 |