Senedd constituencies and electoral regions

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

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

Constituencies

Current constituencies

Constituency (Welsh name)	Electoral population (March 2020)	Principal Areas of Wales	Electoral region
Aberavon Aberafan	51,450	Neath Port Talbot	South Wales West
Aberconwy	45,426	Conwy	North Wales
Alyn and Deeside Alun a Glannau Dyfrdwy	65,183	Flintshire; Wrexham	North Wales
Arfon	43,125	Gwynedd	North Wales
Blaenau Gwent	51,495	Blaenau Gwent	South Wales East
Brecon and Radnorshire Brycheiniog a Sir Faesyfed	55,124	Powys	Mid and West Wales
Bridgend Pen-y-bont ar Ogwr	64,245	Bridgend	South Wales West
Caerphilly Caerffili	64,926	Caerphilly; Newport	South Wales East
Cardiff Central Canol Caerdydd	63,017	Cardiff	South Wales Central
Cardiff North Gogledd Caerdydd	69,143	Cardiff	South Wales Central
Cardiff South and Penarth De Caerdydd a Phenarth	81,366	Cardiff	South Wales Central
Cardiff West Gorllewin Caerdydd	69,511	Cardiff	South Wales Central
Carmarthen East and Dinefwr Dwyrain Caerfyrddin a Dinefwr	58,048	Carmarthenshire	Mid and West Wales
Carmarthen West and South Pembrokeshire Gorllewin Caerfyrddin a De Sir Benfro	59,924	Carmarthenshire; Pembrokeshire	Mid and West Wales
Ceredigion	56,634	Ceredigion	Mid and West Wales
Clwyd South De Clwyd	54,747	Denbighshire; Wrexham	North Wales
Clwyd West Gorllewin Clwyd	58,024	Conwy; Denbighshire	North Wales
Cynon Valley Cwm Cynon	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 Gŵyr	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 Merthyr Tudful a Rhymni	57,883	Caerphilly; Merthyr Tydfil	South Wales East
Monmouth Sir Fynwy	67,252	Monmouthshire	South Wales East
Montgomeryshire Sir Drefaldwyn	49,691	Powys	Mid and West Wales
Neath Castell-nedd	57,032	Neath Port Talbot	South Wales West
Newport East Dwyrain Casnewydd	60,936	Newport	South Wales East
Newport West Gorllewin Casnewydd	68,748	Newport	South Wales East
Ogmore Ogwr	57,934	Rhondda Cynon Taf	South Wales West
Pontypridd	60,923	Rhondda Cynon Taf	South Wales Central
Preseli Pembrokeshire Preseli Sir Benfro	60,025	Pembrokeshire	Mid and West Wales
Rhondda	50,471	Rhondda Cynon Taf	South Wales Central
Swansea East Dwyrain Abertawe	60,726	Swansea	South Wales West
Swansea West Gorllewin Abertawe	59,419	Swansea	South Wales West
Torfaen	63,061	Torfaen	South Wales East
Vale of Clwyd Dyffryn Clwyd	56,307	Denbighshire	North Wales
Vale of Glamorgan Bro Morgannwg	77,204	Vale of Glamorgan	South Wales Central
Wrexham Wrecsam	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
Caernarfon	Gwynedd	North Wales	Arfon, North Wales electoral region
Caernarfon	Gwynedd	North Wales	Dwyfor Meirionnydd, Mid and West Wales electoral region
Conwy	Clwyd	North Wales	Arfon, North Wales electoral region
Conwy	Gwynedd	North Wales	Aberconwy, North Wales electoral region
Meirionnydd Nant Conwy	Clwyd	Mid and West Wales	Aberconwy, North Wales electoral region
Meirionnydd Nant Conwy	Gwynedd	Mid and West Wales	Dwyfor Meirionnydd, Mid and West Wales electoral region

Electoral regions

Electoral region (Welsh name)	Number of constituencies	Constituencies (ordered alphabetically)	Electoral population (March 2020)
Mid and West Wales Canolbarth a Gorllewin Cymru	8	Brecon and Radnorshire, Carmarthen East and Dinefwr, Carmarthen West and South Pembrokeshire, Ceredigion, Dwyfor Meirionnydd, Llanelli, Montgomeryshire, Preseli Pembrokeshire	446,524
North Wales Gogledd Cymru	9	Aberconwy, Alyn and Deeside, Arfon, Clwyd South, Clwyd West, Delyn, Vale of Clwyd, Wrexham, Ynys Môn	483,739
South Wales Central Canol De Cymru	8	Cardiff Central, Cardiff North, Cardiff South and Penarth, Cardiff West, Cynon Valley, Pontypridd, Rhondda, Vale of Glamorgan	523,096
South Wales East Dwyrain De Cymru	8	Blaenau Gwent, Caerphilly, Islwyn, Merthyr Tydfil and Rhymney, Monmouth, Newport East, Newport West, Torfaen	491,142
South Wales West Gorllewin De Cymru	7	Aberavon, Bridgend, Gower, Neath, Ogmore, Swansea East, Swansea West	413,569