List of UK Parliament constituencies in Wales

| rowspan="4" |New constituency

Ogmore (part)

Aberavon (part)

Neath (part)

rowspan="2" |Alyn and Deeside
{{lang|cy|Alun a Glannau Dyfrdwy}}

| rowspan="2" |75,695

| rowspan="2" |205

|Alyn and Deeside (all)

|Flintshire

| rowspan="2" |Expanded constituency

Delyn (part)

|Flintshire

rowspan="4" |Bangor Aberconwy

| rowspan="4" |70,468

| rowspan="4" |1,435

|Aberconwy (all)

|Conwy

| rowspan="4" |New constituency

Clwyd West (part)

|Conwy

Clwyd West (part)

Arfon (part)

|Gwynedd

rowspan="4" |Blaenau Gwent and Rhymney
{{lang|cy|Blaenau Gwent a Rhymni}}

| rowspan="4" |71,079

| rowspan="4" |166

|Blaenau Gwent (all)

|Blaenau Gwent

| rowspan="4" |New constituency

Merthyr Tydfil and Rhymney (part)

Islwyn (part)

Caerphilly (part)

rowspan="2" |Brecon, Radnor and Cwm Tawe
{{lang|cy|Aberhonddu, Maesyfed a Chwm Tawe}}

| rowspan="2" |72,113

| rowspan="2" |3,090

|Brecon and Radnorshire (all)

|Powys

| rowspan="2" |New constituency

Neath (part)

rowspan="2" |Bridgend
{{lang|cy|Pen-y-bont}}

| rowspan="2" |70,770

| rowspan="2" |124

|Bridgend (part)

| rowspan="2" |Redefined constituency

Ogmore (part)

rowspan="2" |Caerfyrddin

| rowspan="2" |72,683

| rowspan="2" |2,034

|Carmarthen East and Dinefwr (part)

| rowspan="2" |Revived constituency

| rowspan="2" |Previously existed 1542–1997 under its English name "Carmarthen".

Carmarthen West and South Pembrokeshire (part)

rowspan="2" | Caerphilly
{{lang|cy|Caerffili}}

| rowspan="2" | 72,458

| rowspan="2" |140

|Caerphilly (part)

| rowspan="2" | Redefined constituency

Islwyn (part)

rowspan="2" |Cardiff East
{{lang|cy|Dwyrain Caerdydd}}

| rowspan="2" |72,463

| rowspan="2" |33

|Cardiff Central (part)

| rowspan="2" |Revived constituency

| rowspan="2" |Name restored; previously existed 1918–1950.

Cardiff South and Penarth (part)

rowspan="2" |Cardiff North
{{lang|cy|Gogledd Caerdydd}}

| rowspan="2" |71,143

| rowspan="2" |49

|Cardiff North (all)

| rowspan="2" |Expanded constituency

Pontypridd (part)

rowspan="4" |Cardiff South and Penarth
{{lang|cy|De Caerdydd a Phenarth}}

| rowspan="4" |72,269

| rowspan="4" |60

|Cardiff South and Penarth (part)

| rowspan="4" |Redefined constituency

Cardiff Central (part)

Cardiff South and Penarth (part)

|Vale of Glamorgan

Vale of Glamorgan (part)

|Vale of Glamorgan

rowspan="2" |Cardiff West
{{lang|cy|Gorllewin Caerdydd}}

| rowspan="2" |73,947

| rowspan="2" |63

|Cardiff West (all)

| rowspan="2" |Expanded constituency

Pontypridd (part)

rowspan="2" |Ceredigion Preseli

| rowspan="2" |74,063

| rowspan="2" |2,458

|Ceredigion (all)

|Ceredigion

| rowspan="2" |New constituency

Preseli Pembrokeshire (part)

|Pembrokeshire

rowspan="5" |Clwyd East
{{lang|cy|Dwyrain Clwyd}}

| rowspan="5" |76,395

| rowspan="5" |676

|Clwyd West (part)

| rowspan="5" |New constituency

Clwyd South (part)

Vale of Clwyd (part)

Delyn (part)

Clwyd South (part)

rowspan="2" |Clwyd North
{{lang|cy|Gogledd Clwyd}}

| rowspan="2" |76,150

| rowspan="2" |170

|Clwyd West (part)

|Conwy

| rowspan="2" |New constituency

Vale of Clwyd (part)

rowspan="3" |Dwyfor Meirionnydd

| rowspan="3" |72,533

| rowspan="3" |2,613

|Clwyd South (part)

| rowspan="3" |Expanded constituency

Dwyfor Meirionnydd (all)

|Gwynedd

Arfon (part)

|Gwynedd

rowspan="2" |Gower
{{lang|cy|Gŵyr}}

| rowspan="2" |76,801

| rowspan="2" |345

|Gower (part)

| rowspan="2" |Redefined constituency

Swansea West (part)

rowspan="2" |Llanelli

| rowspan="2" |69,895

| rowspan="2" |397

|Llanelli (all)

| rowspan="2" |Expanded constituency

Carmarthen East and Dinefwr (part)

rowspan="2" |Merthyr Tydfil and Aberdare
{{lang|cy|Merthyr Tudful ac Aberdâr}}

| rowspan="2" |74,805

| rowspan="2" |245

|Merthyr Tydfil and Rhymney (part)

|Merthyr Tydfil (all)

| rowspan="2" |New constituency

Cynon Valley (part)

rowspan="2" |Mid and South Pembrokeshire
{{lang|cy|Canol a De Sir Benfro}}

| rowspan="2" |76,820

| rowspan="2" |985

|Preseli Pembrokeshire (part)

|Pembrokeshire

| rowspan="2" |New constituency

Carmarthen West and South Pembrokeshire (part)

|Pembrokeshire

rowspan="2" |Monmouthshire
{{lang|cy|Sir Fynwy}}

| rowspan="2" |72,681

| rowspan="2" |884

|Monmouth (part)

|Monmouthshire (all)

| rowspan="2" |Revived constituency

| rowspan="2" |Name restored; previously existed 1536–1885.

Newport East (part)

|Monmouthshire (all)

rowspan="2" |Montgomeryshire and Glyndŵr
{{lang|cy|Maldwyn a Glyndŵr}}

| rowspan="2" |74,223

| rowspan="2" |2,379

|Montgomeryshire (all)

|Powys

| rowspan="2" |New constituency

Clwyd South (part)

|Wrexham

rowspan="4" |Neath and Swansea East
{{lang|cy|Castell-nedd a Dwyrain Abertawe}}

| rowspan="4" |74,705

| rowspan="4" |219

|Aberavon (part)

| rowspan="4" |New constituency

Neath (part)

Gower (part)

Swansea East (part)

rowspan="2" |Newport East
{{lang|cy|Dwyrain Casnewydd}}

| rowspan="2" |76,159

| rowspan="2" |142

|Newport East (part)

|Newport

| rowspan="2" |Redefined constituency

Newport West (part)

|Newport

rowspan="2" |Newport West and Islwyn
{{lang|cy|Gorllewin Casnewydd ac Islwyn}}

| rowspan="2" |76,234

| rowspan="2" |154

|Newport West (part)

|Newport

| rowspan="2" |New constituency

Islwyn (part)

rowspan="3" |Pontypridd

| rowspan="3" |73,743

| rowspan="3" |141

|Cynon Valley (part)

| rowspan="3" |Redefined constituency

Ogmore (part)

Pontypridd (part)

rowspan="4" |Rhondda and Ogmore
{{lang|cy|Rhondda ac Ogwr}}

| rowspan="4" |73,557

| rowspan="4" |199

|Ogmore (part)

| rowspan="4" |New constituency

Ogmore (part)

Pontypridd (part)

Rhondda (all)

rowspan="2" |Swansea West
{{lang|cy|Gorllewin Abertawe}}

| rowspan="2" |74,612

| rowspan="2" |35

|Swansea East (part)

| rowspan="2" |Redefined constituency

Swansea West (part)