What's your Senedd constituency?
On 7 May 2026, voters across Wales will participate in the next Senedd election.
This election is expected to be one of the most significant for Cardiff Bay since the establishment of the National Assembly for Wales in 1999.
A completely new set of constituencies has been created for this election as part of broader reforms to the Senedd's electoral system.
Here's a concise guide to the updated electoral map.
What's changing?
Currently, the Senedd comprises 60 members.
Of these, 40 members are elected to represent individual constituencies.
The remaining 20 are regional Members of the Senedd (MS), with four MSs elected from each of the five electoral regions across Wales.
However, in the upcoming election, the total number of MSs in Cardiff Bay will increase to 96, accompanied by a complete redrawing of the electoral map.
The existing constituencies and regions will be abolished.
They will be replaced by 16 new, larger constituencies, each represented by six MSs.
What are the new constituencies?
Some of the new constituencies cover extensive areas, such as Gwynedd Maldwyn, which stretches from the westernmost tip of the Llyn Peninsula to the border with England.
Below is the full list of the new constituencies:
- Bangor Conwy Môn
- Clwyd
- Fflint
- Wrecsam
- Gwynedd Maldwyn
- Ceredigion Penfro
- Sir Gaerfyrddin
- Gŵyr Abertawe
- Brycheiniog Tawe Nedd
- Afan Ogwr Rhondda
- Pontypridd Cynon Merthyr
- Blaenau Gwent Caerffili Rhymni
- Sir Fynwy Torfaen
- Casnewydd Islwyn
- Caerdydd Penarth
- Caerdydd Ffynnon Taf
- Pen-y-bont Bro Morgannwg
How were the new seats decided?
The new electoral map was developed by Democracy and Boundary Commission Cymru.
Due to limited time before the next Senedd election, the commission was instructed to base the new constituencies on the 32 Welsh constituencies used in the most recent Westminster election, pairing them to form 16 new super-constituencies.
The commission was required to ensure that the paired constituencies were "contiguous," which it interpreted as having a direct road connection between them.
The commission will have the opportunity to review and potentially revise the map following the 2026 election in preparation for the next vote in 2030.
Why do constituencies only have Welsh language names?
The commission was tasked with selecting a single name for each of the new constituencies.
It believes that the chosen names "are acceptable and recognisable for people across Wales."
While language campaigners have welcomed the decision to use Welsh-only names, the move has faced criticism from others.
Welsh Conservative MS Andrew RT Davies said that because Wales is a bilingual country, the constituency names "should be in both languages".
