Compare

Cardiff South and Penarth

Constituency

South Wales. About 112,662 people (mid-2024 estimate) in 55 square kilometres.

MP for Cardiff South and Penarth

Stephen DoughtyLabour (Co-op)MP since

They won by 11,767 votes on a 53.6% turnout.

As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

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Radon Affected Area by constituency

Worked out by Open Index · 2022

Under 1%90% or more

About 29% of people in Cardiff South and Penarth live in a 1 km square that the radon atlas marks as a radon Affected Area.

Majority, 2024 general election
30.0%
Joint 94th largest majority of 650
House of Commons Library · Jul 2024
Turnout, 2024 general election
53.6%
Joint 128th lowest turnout of 650
House of Commons Library · Jul 2024
Population
106,453
201st most populated of 650
ONS Census 2021 · 2021
People in radon Affected Area squares
29%
UK 44%
Worked out by Open Index

2024 general election result

Candidates in Cardiff South and Penarth at the general election on 4 July 2024, in finishing order
CandidatePartyVotesShare
Stephen DoughtyElectedLabour and Co-operative Party17,42844.5%
Anthony SlaughterGreen Party5,66114.5%
Ellis SmithConservative5,45913.9%
Simon LlewellynReform UK4,49311.5%
Sharifah RahmanPlaid Cymru3,2278.2%
Alex WilsonLiberal Democrat2,9087.4%
Electorate
73,060
Turnout
53.6%
Majority
11,767 (30.0%)
Valid votes
39,176
Rejected ballots
221

Polling day . Shares are of valid votes; turnout is valid votes as a share of the electorate. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: House of Commons Library, UK Parliament election results. The result from the House of Commons Library

How Cardiff South and Penarth compares

Each dot is a constituency. The black line marks the middle one.

Cardiff South and PenarthMiddle
Majority, 2024 general election650 constituencies, UK · Jul 2024
Majority, 2024 general election: every constituency in UK650 areas from 0.0% to 60.6%. The middle area is 14.1%. Cardiff South and Penarth is 30.0%.
30.0%joint 94th largest majority
Turnout, 2024 general election650 constituencies, UK · Jul 2024
Turnout, 2024 general election: every constituency in UK650 areas from 40.0% to 75.2%. The middle area is 60.0%. Cardiff South and Penarth is 53.6%.
53.6%joint 128th lowest turnout
Population650 constituencies, UK · 2021
Population: every constituency in UK650 areas from 26,159 to 151,876. The middle area is 100,988. Cardiff South and Penarth is 106,453.
106,453201st most populated
People in radon Affected Area squares650 constituencies, UK · 2022
People in radon Affected Area squares: every constituency in UK650 areas from 0.0% to 100.0%. The middle area is 39.0%. Cardiff South and Penarth is 29.0%.
29%joint 276th fewest people in radon Affected Areas

Every constituency ranked: population and people in radon affected area squares.

What is the population of Cardiff South and Penarth?

Cardiff South and Penarth had 106,453 usual residents at the census.

Cardiff South and Penarth is the 201st most populated of 650 in the UK.

Figures for the whole of Vale of Glamorgan

Most of Cardiff South and Penarth lies in Vale of Glamorgan. These figures are published for the whole of Vale of Glamorgan, not for constituencies, so they describe the council and not Cardiff South and Penarth itself. See Vale of Glamorgan

Average house price
£300,358
Up 3.2% in a year
HM Land Registry · Aug 2026
Median full-time pay
£38,656
169th highest paid of 348
ONS earnings survey · 2025
House price to pay
7.8×
Joint 140th least affordable of 348
Worked out by Open Index
Population estimate
135,362
No change in a year
ONS population estimates · 2025
Cardiff South and Penarth in brief

The winner in Cardiff South and Penarth had a majority of 30.0% of valid votes at the general election on 4 July 2024.

Turnout in Cardiff South and Penarth at the general election on 4 July 2024 was 53.6%.

Cardiff South and Penarth had 106,453 usual residents at the census.

About 29% of people in Cardiff South and Penarth live in a 1 km square that the radon atlas marks as a radon Affected Area.