Senedd constituencies and electoral regions

The Senedd, the unicameral parliament of Wales, has 40 single-member constituencies () and five multi-member electoral regions ().

The boundaries and names of the 40 constituencies are the same as those in the House of Commons in the Westminster Parliament.

### Current constituencies

|Constituency (_Welsh name_)|Electoral population (March 2020)|Principal Areas of Wales|Electoral region|
| --- | --- | --- | --- |
|Aberavon|51,450|Neath Port Talbot|South Wales West|
|Aberconwy|45,426|Conwy|North Wales|
|Alyn and Deeside|65,183|Flintshire; Wrexham|North Wales|
|Arfon|43,125|Gwynedd|North Wales|
|Blaenau Gwent|51,495|Blaenau Gwent|South Wales East|
|Brecon and Radnorshire|55,124|Powys|Mid and West Wales|
|Bridgend|64,245|Bridgend|South Wales West|
|Caerphilly|64,926|Caerphilly; Newport|South Wales East|
|Cardiff Central|63,017|Cardiff|South Wales Central|
|Cardiff North|69,143|Cardiff|South Wales Central|
|Cardiff South and Penarth|81,366|Cardiff|South Wales Central|
|Cardiff West|69,511|Cardiff|South Wales Central|
|Carmarthen East and Dinefwr|58,048|Carmarthenshire|Mid and West Wales|
|Carmarthen West and South Pembrokeshire|59,924|Carmarthenshire; Pembrokeshire|Mid and West Wales|
|Ceredigion|56,634|Ceredigion|Mid and West Wales|
|Clwyd South|54,747|Denbighshire; Wrexham|North Wales|
|Clwyd West|58,024|Conwy; Denbighshire|North Wales|
|Cynon Valley|51,461|Rhondda Cynon Taf|South Wales Central|
|Delyn|55,604|Conwy; Flintshire|North Wales|
|Dwyfor Meirionnydd|44,882|Gwynedd|Mid and West Wales|
|Gower|62,763|Swansea|South Wales West|
|Islwyn|56,841|Caerphilly|South Wales East|
|Llanelli|62,196|Carmarthenshire; Swansea|Mid and West Wales|
|Merthyr Tydfil and Rhymney|57,883|Caerphilly; Merthyr Tydfil|South Wales East|
|Monmouth|67,252|Monmouthshire|South Wales East|
|Montgomeryshire|49,691|Powys|Mid and West Wales|
|Neath|57,032|Neath Port Talbot|South Wales West|
|Newport East|60,936|Newport|South Wales East|
|Newport West|68,748|Newport|South Wales East|
|Ogmore|57,934|Rhondda Cynon Taf|South Wales West|
|Pontypridd|60,923|Rhondda Cynon Taf|South Wales Central|
|Preseli Pembrokeshire|60,025|Pembrokeshire|Mid and West Wales|
|Rhondda|50,471|Rhondda Cynon Taf|South Wales Central|
|Swansea East|60,726|Swansea|South Wales West|
|Swansea West|59,419|Swansea|South Wales West|
|Torfaen|63,061|Torfaen|South Wales East|
|Vale of Clwyd|56,307|Denbighshire|North Wales|
|Vale of Glamorgan|77,204|Vale of Glamorgan|South Wales Central|
|Wrexham|52,713|Wrexham|North Wales|
|Ynys Môn|52,610|Isle of Anglesey|North Wales|

### Former constituencies

|Former constituency|Preserved county|Region of former constituency|Replacement constituencies and regions||
| --- | --- | --- | --- | --- |
|rowspan="2"|Caernarfon|Gwynedd|North Wales|Arfon, North Wales electoral region|
|Dwyfor Meirionnydd, Mid and West Wales electoral region|||||
|rowspan="2"|Conwy|Clwyd|North Wales|Arfon, North Wales electoral region|
|Gwynedd|Aberconwy, North Wales electoral region||||
|rowspan="2"|Meirionnydd Nant Conwy|Clwyd|Mid and West Wales|Aberconwy, North Wales electoral region|
|Gwynedd|Dwyfor Meirionnydd, Mid and West Wales electoral region||||

## Electoral regions

|Electoral region (_Welsh name_)|Number of constituencies|Constituencies <small>(ordered alphabetically)</small>|Electoral population (March 2020)|Image <small>(numbered alphabetically)</small>|
| --- | --- | --- | --- | --- |
|Mid and West Wales|8|Brecon and Radnorshire, Carmarthen East and Dinefwr, Carmarthen West and South Pembrokeshire, Ceredigion, Dwyfor Meirionnydd, Llanelli, Montgomeryshire, Preseli Pembrokeshire|446,524||
|North Wales|9|Aberconwy, Alyn and Deeside, Arfon, Clwyd South, Clwyd West, Delyn, Vale of Clwyd, Wrexham, Ynys Môn|483,739||
|South Wales Central|8|Cardiff Central, Cardiff North, Cardiff South and Penarth, Cardiff West, Cynon Valley, Pontypridd, Rhondda, Vale of Glamorgan|523,096||
|South Wales East|8|Blaenau Gwent, Caerphilly, Islwyn, Merthyr Tydfil and Rhymney, Monmouth, Newport East, Newport West, Torfaen|491,142||
|South Wales West|7|Aberavon, Bridgend, Gower, Neath, Ogmore, Swansea East, Swansea West|413,569||

## Related pages

- List of UK Parliament constituencies in Wales