# Cynon Valley (Senedd constituency)

Cynon Valley (Welsh: Cwm Cynon) is a constituency of the Senedd. It elects one Member of the Senedd by the first past the post method of election. It is also one of eight constituencies in the South Wales Central electoral region, which elects four additional members, in addition to eight constituency members, to produce a degree of proportional representation for the region as a whole.

## Boundaries

The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Cynon Valley Westminster constituency. It is entirely within the preserved county of Mid Glamorgan.
The other seven constituencies of the region are Cardiff Central, Cardiff North, Cardiff South and Penarth, Cardiff West, Pontypridd, Rhondda and Vale of Glamorgan.

## Voting

In general elections for the Senedd, each voter has two votes. The first vote may be used to vote for a candidate to become the Member of the Senedd for the voter's constituency, elected by the first past the post system. The second vote may be used to vote for a regional closed party list of candidates. Additional member seats are allocated from the lists by the d'Hondt method, with constituency results being taken into account in the allocation.

## Assembly members and Members of the Senedd

| Election | Election | Member | Party | Portrait |
| | 1999 | Christine Chapman | Labour Co-operative | |
| | 2016 | Vikki Howells | Labour | |

## Elections
### Elections in the 2020s

2021 Senedd election: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Vikki Howells | 11,427 | 55.3 | +4.2 | 10,279 | 50.1 | +7.0 |
| | Plaid Cymru | Geraint Benney | 3,959 | 19.3 | -0.6 | 3,935 | 19.2 | -4.7 |
| | Conservative | Mia Rees | 2,795 | 13.6 | +7.5 | 3,220 | 15.7 | +9.3 |
| | Propel | Vicky Jenkins | 713 | 3.5 | New | 325 | 1.6 | New |
| | Abolish | Martyn Ford | 648 | 3.2 | New | 660 | 3.2 | -0.3 |
| | Reform UK | Peter Hopkins | 356 | 1.7 | New | 284 | 1.4 | New |
| | Liberal Democrats | Gerald Francis | 335 | 1.6 | -0.1 | 324 | 1.6 | -0.4 |
| | Independent | Gareth Bennett | 278 | 1.4 | New | | | |
| | Green | Green | Green | Green | Green | 625 | 3.0 | +0.8 |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 352 | 1.7 | -14.5 |
| | Gwlad | Gwlad | Gwlad | Gwlad | Gwlad | 153 | 0.7 | New |
| | No More Lockdowns | No More Lockdowns | No More Lockdowns | No More Lockdowns | No More Lockdowns | 121 | 0.6 | New |
| | Workers Party | Workers Party | Workers Party | Workers Party | Workers Party | 64 | 0.3 | New |
| | TUSC | TUSC | TUSC | TUSC | TUSC | 56 | 0.3 | -0.1 |
| | Communist | Communist | Communist | Communist | Communist | 53 | 0.3 | -0.1 |
| | Independent Alan Coulthard | Independent Alan Coulthard | Independent Alan Coulthard | Independent Alan Coulthard | Independent Alan Coulthard | 50 | 0.2 | New |
| Majority | Majority | Majority | 7,468 | 36.0 | +4.8 |
| Turnout | Turnout | Turnout | 20,511 | 39.05 | +0.8 |
| | Labour hold | Labour hold | Swing | | |
| Notes ↑ Incumbent member for this constituency |||||||||

### Elections in the 2010s

Welsh Assembly Election 2016: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Vikki Howells | 9,830 | 51.1 | -10.9 | 8,295 | 43.1 | -10.3 |
| | Plaid Cymru | Cerith Griffiths | 3,836 | 19.9 | -7.3 | 4,601 | 23.9 | -0.6 |
| | UKIP | Liz Wilks | 3,460 | 18.0 | New | 3,120 | 16.2 | |
| | Conservative | Lyn Hudson | 1,177 | 6.1 | -2.1 | 1,227 | 6.4 | -1.2 |
| | Green | John Matthews | 598 | 3.1 | New | 426 | 2.2 | -1.1 |
| | Liberal Democrats | Michael Wallace | 335 | 1.7 | -0.9 | 385 | 2.0 | -0.8 |
| | Abolish | Abolish | Abolish | Abolish | Abolish | 670 | 3.5 | New |
| | Women's Equality | Women's Equality | Women's Equality | Women's Equality | Women's Equality | 149 | 0.8 | New |
| | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | 102 | 0.5 | -0.1 |
| | TUSC | TUSC | TUSC | TUSC | TUSC | 79 | 0.4 | -0.1 |
| | Communist | Communist | Communist | Communist | Communist | 70 | 0.4 | +0.1 |
| | Freedom to Choose / Vapers in Power | Freedom to Choose / Vapers in Power | Freedom to Choose / Vapers in Power | Freedom to Choose / Vapers in Power | Freedom to Choose / Vapers in Power | 56 | 0.3 | New |
| | Independent (Jonathan Bishop) | Independent (Jonathan Bishop) | Independent (Jonathan Bishop) | Independent (Jonathan Bishop) | Independent (Jonathan Bishop) | 51 | 0.3 | New |
| Majority | Majority | Majority | 5,994 | 31.2 | −3.6 |
| Turnout | Turnout | Turnout | 19,236 | 38.2 | +2.3 |
| | Labour hold | Labour hold | Swing | | |
Welsh Assembly Election 2011: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour Co-op | Christine Chapman | 11,626 | 62.0 | +5.3 | 9,730 | | |
| | Plaid Cymru | Dafydd Trystan Davies | 5,111 | 27.2 | -0.6 | 4,254 | | |
| | Conservative | Daniel Saxton | 1,531 | 8.2 | -2.2 | 1,378 | | |
| | Liberal Democrats | Ian Walton | 492 | 2.6 | -2.5 | 507 | | |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 73 | | - |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 781 | | |
| | Green | Green | Green | Green | Green | 609 | | |
| | BNP | BNP | BNP | BNP | BNP | 409 | | - |
| | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | 228 | | |
| | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | 104 | | New |
| | TUSC | TUSC | TUSC | TUSC | TUSC | 96 | | New |
| | Communist | Communist | Communist | Communist | Communist | 57 | | - |
| Majority | Majority | Majority | 6,515 | 34.8 | +5.9 |
| Turnout | Turnout | Turnout | 18,760 | 35.9 | −2.5 |
| | Labour Co-op hold | Labour Co-op hold | Swing | +3.0 | |
Note: The Electoral Commission record the UKIP regional vote here as 73. That figure would be by far the lowest in Wales and not in keeping with historic figures here or equivalent figures elsewhere in the South Wales Valleys, South Wales Central and Wales at this election. Regional ballots rejected at the count: 118<

### Elections in the 2000s

Welsh Assembly Election 2007: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour Co-op | Christine Chapman | 11,058 | 56.7 | -8.3 | 10,036 | 50.6 | -5.4 |
| | Plaid Cymru | Liz A. Walters | 5,435 | 27.8 | +6.5 | 4,214 | 21.3 | +0.5 |
| | Conservative | Neill S.M. John | 2,024 | 10.4 | +3.8 | 1,401 | 7.1 | -0.4 |
| | Liberal Democrats | Margaret H. Phelps | 1,000 | 5.1 | -2.5 | 1,232 | 6.2 | +0.2 |
| | BNP | BNP | BNP | BNP | BNP | 912 | 4.6 | New |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 769 | 3.9 | ±0.0 |
| | Green | Green | Green | Green | Green | 528 | 2.7 | -0.3 |
| | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | 211 | 1.1 | New |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 200 | 1.0 | -2.1 |
| | Communist | Communist | Communist | Communist | Communist | 89 | 0.4 | +0.3 |
| | Socialist Alternative | Socialist Alternative | Socialist Alternative | Socialist Alternative | Socialist Alternative | 84 | 0.4 | New |
| | Respect | Respect | Respect | Respect | Respect | 68 | 0.3 | New |
| | CPA | CPA | CPA | CPA | CPA | 39 | 0.2 | New |
| | Socialist Equality | Socialist Equality | Socialist Equality | Socialist Equality | Socialist Equality | 36 | 0.2 | New |
| Majority | Majority | Majority | 5,623 | 28.9 | −13.9 |
| Turnout | Turnout | Turnout | 19,517 | 38.4 | +1.2 |
| | Labour Co-op hold | Labour Co-op hold | Swing | −7.2 | |
Welsh Assembly Election 2003: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour Co-op | Christine Chapman | 10,841 | 65.0 | +19.4 | 9,329 | 56.1 | +14.1 |
| | Plaid Cymru | David A. Walters | 3,724 | 22.3 | −20.2 | 3,454 | 20.8 | -23.0 |
| | Liberal Democrats | Rob O. Humphreys | 1,120 | 6.7 | −0.4 | 1,238 | 7.4 | +0.3 |
| | Conservative | Daniel C.B. Thomas | 984 | 5.9 | +1.1 | 1,001 | 6.0 | +1.4 |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 522 | 3.1 | Unknown |
| | Green | Green | Green | Green | Green | 392 | 2.4 | Unknown |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 314 | 1.9 | New |
| | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | 123 | 0.7 | New |
| | New Millennium Bean Partyn | New Millennium Bean Partyn | New Millennium Bean Partyn | New Millennium Bean Partyn | New Millennium Bean Partyn | 86 | 0.5 | New |
| | Communist | Communist | Communist | Communist | Communist | 75 | 0.5 | Unknown |
| | Vote No 2 Stop the War | Vote No 2 Stop the War | Vote No 2 Stop the War | Vote No 2 Stop the War | Vote No 2 Stop the War | 71 | 0.4 | New |
| | ProLife Alliance | ProLife Alliance | ProLife Alliance | ProLife Alliance | ProLife Alliance | 31 | 0.2 | New |
| Majority | Majority | Majority | 7,117 | 42.7 | +39.6 |
| Turnout | Turnout | Turnout | 16,669 | 37.5 | −8.1 |
| | Labour Co-op hold | Labour Co-op hold | Swing | +19.8 | |
2003 Electorate: 44,473 Regional ballots rejected: 345

### Elections in the 1990s

Welsh Assembly Election 1999: Cynon Valley :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour Co-op | Christine Chapman | 9,883 | 45.6 | N/A | 9,000 | 42.0 | N/A |
| | Plaid Cymru | Phil Richards | 9,206 | 42.5 | N/A | 9,385 | 43.8 | N/A |
| | Liberal Democrats | Alison L. Willott | 1,531 | 7.1 | N/A | 1,513 | 7.1 | N/A |
| | Conservative | Edmund R. Hayward | 1,046 | 4.8 | N/A | 997 | 4.6 | N/A |
| | Others | Others | Others | Others | Others | 554 | 2.6 | N/A |
| Majority | Majority | Majority | 932 | 3.1 | N/A |
| Turnout | Turnout | Turnout | 21,666 | 45.6 | N/A |
| | Labour Co-op win (new seat) | Labour Co-op win (new seat) | Labour Co-op win (new seat) | Labour Co-op win (new seat) | Labour Co-op win (new seat) |
1999 Electorate: 47,508