Senedd constituencies and electoral regions

A map of the 40 constituencies and the five electoral regions of Wales.

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
Dwyfor Meirionnydd, Mid and West Wales electoral region
Conwy Clwyd North Wales Arfon, North Wales electoral region
Gwynedd Aberconwy, North Wales electoral region
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

(ordered alphabetically)

Electoral population (March 2020) Image

(numbered alphabetically)

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

References