This by-election was called after the death of Labour councillor Peter Cooper. The ward last elected two councillors together, in May 2022; Plaid Cymru took the most votes with 54 per cent. Earlier contests were won by Plaid Cymru in 2018 and led by Plaid Cymru in 2017. 6 candidates stood.
Every ward and councillor, who runs the council, and each by-election since May.
Carmarthenshire council page →| Party | Share |
|---|---|
| Plaid Cymru | 43.9% |
| Reform UK | 28.0% |
| Labour | 17.6% |
| Conservative | 4.9% |
| Independent | 4.5% |
| Liberal Democrats | 1.2% |
Independent, Reform UK, Labour, Conservative, Liberal Democrats: fewer than 6 wins in 100 each.
How often each candidate wins the seat across 10,000 simulations of this contest - chances of winning, not vote shares.
| Result | Conservative | Labour | Liberal Democrats | Plaid Cymru | Independents |
|---|---|---|---|---|---|
| May 2022 | - | 30% | 6% | 54% | 10% |
| Jul 2018 | 13% | 21% | 1% | 65% | - |
| May 2017 | 14% | 35% | - | 51% | - |
Winning share of all votes cast in bold. Multi-member wards elect several councillors at once. Includes any county-division contest covering the same ground.
Carmarthenshire is a Welsh council: it runs every local service. Current control: Plaid Cymru.
Seats under the independents-and-others heading here have been won by independents at elections since 2022.
Carmarthenshire council page →
How every council in Britain stands →
Wards coloured by the party that last won them; the by-election ward is outlined. Hover a ward for its last result.
Sir Gaerfyrddin Senedd seat, May 2026: Plaid Cymru 43%, Reform UK 33%, Labour 8%.
The ward is part of the Caerfyrddin constituency. Plaid Cymru MP Ann Davies won it at the 2024 general election with 34 per cent of the vote.