Below are lists of Plaid Cymru target seats showing which constituencies can be most easily won from an opposing party relative to the latest elections.
Below is the list of Plaid Cymru target seats for the 2024 general election. The list is ordered from the smallest to the largest swing needed for the seat to change hands.
View Plaid Cymru held marginal seats vulnerable at the next general election.
(order by percentage majority)
| Rank | Constituency | Region | Majority over PC | Swing Needed | |
|---|---|---|---|---|---|
| 1. | Ynys Mon | Wales | 2,541 | 3.48% | |
| 2. | Caerfyrddin | Wales | 4,529 | 4.25% | |
| 3. | Llanelli | Wales | 7,976 | 9.53% | |
| 4. | Caerphilly | Wales | 13,153 | 14.59% | |
| 5. | Pontypridd | Wales | 16,291 | 17.87% | |
| 6. | Neath and Swansea East | Wales | 17,282 | 19.70% | |
| 7. | Cardiff West | Wales | 21,632 | 21.34% | |
| 8. | Merthyr Tydfil and Aberdare | Wales | 18,779 | 21.78% | |
| 9. | Rhondda and Ogmore | Wales | 18,659 | 21.93% | |
| 10. | Aberafan Maesteg | Wales | 19,518 | 21.97% | |
| 11. | Blaenau Gwent and Rhymney | Wales | 18,528 | 22.01% | |
| 12. | Bangor Aberconwy | Wales | 11,506 | 22.22% | |
| 13. | Swansea West | Wales | 20,114 | 22.80% | |
| 14. | Montgomeryshire and Glyndwr | Wales | 26,447 | 25.82% | |
| 15. | Cardiff South and Penarth | Wales | 24,939 | 25.98% | |
| 16. | Brecon, Radnor and Cwm Tawe | Wales | 22,676 | 25.99% | |
| 17. | Monmouthshire | Wales | 26,285 | 29.22% | |
| 18. | Cardiff East | Wales | 27,411 | 29.30% | |
| 19. | Torfaen | Wales | 17,050 | 29.71% | |
| 20. | Pembrokeshire Mid and South | Wales | 26,155 | 31.90% | |
View Plaid Cymru held marginal seats vulnerable at the next general election.
Below is the list of Plaid Cymru target seats for the 2026 Senedd election. The list is ordered from the smallest to the largest swing needed for the seat to change hands.
View Plaid Cymru held marginal seats vulnerable at the next Senedd election.
(order by percentage majority)
| Rank | Constituency | Region | Majority over PC | Swing Needed | |
|---|---|---|---|---|---|
| 1. | Aberconwy | North Wales | 3,336 | 7.08% | |
| 2. | Caerphilly | South Wales East | 5,078 | 8.78% | |
| 3. | Llanelli | Mid and West Wales | 5,675 | 9.39% | |
| 4. | Neath | South Wales West | 5,221 | 9.47% | |
| 5. | Pontypridd | South Wales Central | 5,328 | 9.67% | |
| 6. | Wrexham | North Wales | 3,620 | 10.04% | |
| 7. | Clwyd West | North Wales | 6,230 | 10.98% | |
| 8. | Carmarthen West and Pembrokeshire South | Mid and West Wales | 4,625 | 11.65% | |
| 9. | Rhondda | South Wales Central | 5,497 | 11.72% | |
| 10. | Islwyn | South Wales East | 6,032 | 12.32% | |
| 11. | Aberavon | South Wales West | 5,745 | 12.96% | |
| 12. | Clwyd South | North Wales | 6,354 | 14.22% | |
| 13. | Swansea West | South Wales West | 7,216 | 15.04% | |
| 14. | Montgomeryshire | Mid and West Wales | 7,528 | 15.06% | |
| 15. | Preseli Pembrokeshire | Mid and West Wales | 6,160 | 15.10% | |
| 16. | Blaenau Gwent | South Wales East | 6,638 | 15.94% | |
| 17. | Cardiff West | South Wales Central | 11,768 | 16.11% | |
| 18. | Ogmore | South Wales West | 8,165 | 16.67% | |
| 19. | Cardiff Central | South Wales Central | 9,630 | 16.88% | |
| 20. | Bridgend | South Wales West | 9,297 | 17.76% | |
| 21. | Cardiff South and Penarth | South Wales Central | 13,196 | 18.13% | |
| 22. | Cynon Valley | South Wales Central | 7,468 | 18.20% | |
| 23. | Torfaen | South Wales East | 9,008 | 18.80% | |
| 24. | Gower | South Wales West | 11,685 | 20.78% | |
| 25. | Brecon and Radnorshire | Mid and West Wales | 10,666 | 21.32% | |
View Plaid Cymru held marginal seats vulnerable at the next Senedd election.