; ) is a six-member constituency of the Senedd (Welsh Parliament; ) used in the 2026 Senedd election. It covers Carmarthenshire in West Wales.
It was proposed following the 2026 review of Senedd constituencies, and is a pairing of the two UK Parliament constituencies of Caerfyrddin and Llanelli. It has a Welsh-only name.
Boundaries The borders of the constituency are the same as those of the county of Carmarthenshire.
A Senedd constituency comprising the boundaries of the UK Parliament constituencies of Caerfyrddin and Llanelli, has been proposed by the Democracy and Boundary Commission Cymru for the 2026 election to the Senedd (Welsh Parliament; ). It was initially proposed using the English name Carmarthenshire in September 2024, but was renamed to in December proposals with most constituencies using Welsh-only names. It was then given the Welsh-only name and its boundaries were confirmed in the commission's final recommendations in March 2025. When announcing their candidates, Reform UK used "Caerfyrddin, Llanelli" instead, using the names for the pair of UK Parliament constituencies that form it.
The constituency was established in 2026, following the passing of the Senedd Cymru (Members and Elections) Act 2024. The act legislates electoral reform of the Senedd to create 16 larger "super constituencies", pairing the 32 UK Parliament constituencies in Wales, and using a new fully proportional voting system, with each constituency electing six Members of the Senedd (MSs) rather than one previously. Members of the Senedd Term Election Distribution MS MS MS MS MS MS 7th 2026 3 3 Cefin Campbell(PC) Gareth Beer(Ref) Nerys Evans(PC) Carmelo Colasanto(Ref) Adam Price(PC) Sarah Edwards(Ref)
Elections Elections in the 2020s
2021 notional result Party Vote % Seats Labour 26,572 34.8 3 Plaid Cymru 26,208 34.3 2 Conservative 17,273 22.6 1 Liberal Democrats 2,079 2.7 0 Reform UK 1,663 2.2 0 UKIP 1,122 1.5 0 Independent 894 1.2 0 Gwlad 544 0.7 0
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