Cardiff South and Penarth crosses the boundary between Cardiff and the Vale of Glamorgan. On the Cardiff side it includes communities around the city’s southern waterfront and Cardiff Bay, while to the south-west it extends across the River Ely toward Penarth. The constituency is predominantly urban and includes dense inner-city neighbourhoods, former dockland areas, modern waterfront development and established residential suburbs. Penarth provides a distinct coastal town centre overlooking the Severn Estuary, while the Cardiff section is closely tied to the capital’s central and bay areas. The coastline, docks, rivers and transport corridors give the seat a strong waterfront character despite its largely built-up setting.
Election data comes from UK Parliament. Turnout percentage is calculated by Project Open Gov from Parliament's turnout and electorate figures.
People and place
A population and household snapshot for Cardiff South and Penarth, using validated House of Commons Library constituency datasets.
Estimated population112,662
EstimateMid-2024 estimate
Region / nationWales
Age profile
0 to 1716.8% · 18,886 people
18 to 2421.7% · 24,487 people
25 to 3417.6% · 19,799 people
35 to 4917.6% · 19,829 people
50 to 6413.5% · 15,190 people
65 and over12.8% · 14,471 people
Population figures are mid-2024 estimates from the House of Commons Library. Project Open Gov calculates the estimated population shown above by summing the six published age-band counts. View population source ↗
Home ownership and renting
Housing tenure shows how households in this constituency described their home at the most recent census.
42,949 householdsCensus 2021
Home owners51.6% · 22,145 households
Private renters33.2% · 14,239 households
Social renters14.8% · 6,339 households
Other tenure0.5% · 226 households
“Other tenure” combines shared ownership and households recorded as living rent free.
Housing-tenure figures come from the most recent census: 2021 in England, Wales and Northern Ireland and 2022 in Scotland. View housing-tenure source ↗
Household composition
A broad view of household types in this constituency. Project Open Gov uses the four broad groups supplied by the Commons Library so the presentation remains consistent across the UK.
42,951 householdsCensus 2021
One-person households34.3% · 14,712 households
Families with dependent children23.6% · 10,118 households
Other single-family households30.4% · 13,061 households
Other household types11.8% · 5,060 households
Household-composition figures come from the Commons Library constituency dataset. The source uses census data and Project Open Gov displays its broad household groups rather than attempting to harmonise the detailed categories itself. View household-composition source ↗
Disability and day-to-day activities
The source records whether day-to-day activities are limited and uses separate person-level tables for England & Wales, Scotland and Northern Ireland.
106,457 people in the source baseCensus 2021Source comparison: England & Wales
Day-to-day activities limited a lot7.3% · 7,817 people
Day-to-day activities limited a little10.0% · 10,636 people
Not disabled under the Equality Act82.7% · 88,004 people
Comparison note: the workbook uses different source terminology across the UK: England & Wales uses “Disabled under the Equality Act”, while Scotland and Northern Ireland use “Disabled” / “Non-disabled”. Project Open Gov therefore preserves the source categories and does not present them as one single like-for-like UK legal definition.
Disability figures come from the Commons Library constituency workbook. This profile uses the person-level tables only; the workbook also contains separate household-level disability tables which are not used here. View disability source ↗
Petitions
Open UK Government and Parliament petitions that have reached at least 10,000 signatures nationally, ranked here by the number of signatures recorded in this constituency.
Petition signatures are not a poll and do not show what the constituency as a whole thinks. A person can also sign more than one petition.
Open petitionCloses 12 September 2026
Make a public animal abuser register & automatically ban ownership
Signatures in this constituency488
Signatures nationally244,689
Government response published · Debate scheduled for 29 June 2026
Signature counts come from the official UK Government and Parliament petitions data and may change while a petition remains open. Browse official petitions ↗
Funding and local projects
National Lottery grants awarded to organisations recorded in this parliamentary constituency since 4 July 2024.
The constituency is based on the recipient organisation recorded in the source data. The funded activity may sometimes take place across a wider area.
Grants recorded384
Total awarded£21,556,654
Most recent awards
National Lottery grantAwarded 29 June 2026
AI For Good
ProMo-Cymru Ltd
£499,998
The National Lottery Community Fund · Charitable and Community including Health, Education and Environment
About this award
ProMo-Cymru Ltd - Other - Supporting Great Ideas
National Lottery grantAwarded 24 June 2026
The Seasonings
Art Shell
£9,920
Arts Council of Wales | Cyngor Celfyddydau Cymru · Arts
About this award
The Seasonings project is focussed on the professional development of eight artists and members of Grangetown Youth Forum for four rounds of residencies, taking place over a year at Grangetown Studios. The project runs in partnership with Grangetown Youth Forum, with guidance from G39. This four block program has been developed based on feedback from previous artists and offers practical arts workshops and opportunities to learn new creative skills. The purpose of the residency is to offer dedicated space and time to explore and develop the personal practice of the residency artists and for them to meet, engage and learn from their peers, other more established artists and the wider Grangetown community. During their time on the residency artists and forum members are offered regular 1-1 sessions with G39 and Art Shell, include creative conversations, guidance on funding, signposting to other opportunities and connections with other matched organisations and individuals.
National Lottery grantAwarded 19 June 2026
CoDI 26-27
Ty Cerdd
£65,000
Arts Council of Wales | Cyngor Celfyddydau Cymru · Arts
About this award
Tŷ Cerdd CoDI 26-27 supports and enables music-creators across a wide range of genres around Wales, offering artist-led creative interventions alongside professional- and career-development opportunities. The themes for the 26-27 programme are Experimentation, Voice and Communication. Artists and their creativity are nurtured through a lens of diversity and access. Creative development opportunities are intentionally inclusive, with Welsh language and accessible ways of working running through them, and underpinned by Fair Access Principles. All work is underpinned by TC's Cornerstones, keeping sustainable practices central to activity.
National Lottery grantAwarded 11 June 2026
Hope Design Solutions C.I.C.
Hope Design Solutions C.I.C.
£20,000
The National Lottery Community Fund · Charitable and Community including Health, Education and Environment
About this award
Hope Design Solutions C.I.C. - Environment - National Lottery Awards for All Wales
National Lottery grantAwarded 10 June 2026
Wales - BFI Film Academy Hub 2026-2029
Screen Alliance for Wales Ltd
£427,000
British Film Institute · Arts
About this award
BFI Film Academy is the BFI's flagship training programme for young people aged 16-25 who are looking to break into the screen industries. It offers a hands-on, collaborative filmmaking experience, with a strong focus on developing technical skills.
379 more awards are available.
Source: DCMS National Lottery Grants Database. The figures shown cover awards from 4 July 2024 to 1 July 2026. View official grants data ↗
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