# Caerphilly (Senedd constituency)

Caerphilly (Welsh: Caerffili) is a constituency of the Senedd. It elects one Member of the Senedd by the first past the post method of election. It is additionally one of eight constituencies in the South Wales East 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 Caerphilly Westminster constituency.
The other seven constituencies of the South Wales East electoral region are Blaenau Gwent, Islwyn, Merthyr Tydfil and Rhymney, Monmouth, Newport East, Newport West and Torfaen.

## 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 | Member | Party |
| 1999 | Ron Davies | Labour |
| 2003 | Jeffrey Cuthbert | Labour |
| 2016 | Hefin David | Labour |

## Results
### Elections in the 2020s

2021 Senedd election: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Hefin David | 13,289 | 46.0 | +10.7 | 11,230 | 38.7 | +4.0 |
| | Plaid Cymru | Delyth Jewell | 8,211 | 28.4 | -1.1 | 8,277 | 28.5 | +2.6 |
| | Conservative | Steven Mayfield | 5,013 | 17.3 | +8.4 | 5,172 | 17.8 | +7.7 |
| | Abolish | Stephen Jones | 1,119 | 3.9 | New | 1,134 | 3.9 | +0.8 |
| | Green | Green | Green | Green | Green | 1,074 | 3.7 | +1.3 |
| | Liberal Democrats | Steven Aicheler | 787 | 2.7 | +1.3 | 644 | 2.2 | +0.3 |
| | Reform UK | Tim Price | 495 | 1.7 | New | 342 | 1.2 | New |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 505 | 1.7 | -18.8 |
| | Gwlad | Gwlad | Gwlad | Gwlad | Gwlad | 180 | 0.6 | New |
| | No More Lockdowns | No More Lockdowns | No More Lockdowns | No More Lockdowns | No More Lockdowns | 174 | 0.6 | New |
| | Propel | Propel | Propel | Propel | Propel | 115 | 0.4 | New |
| | Communist | Communist | Communist | Communist | Communist | 86 | 0.3 | ±0.0 |
| | TUSC | TUSC | TUSC | TUSC | TUSC | 71 | 0.2 | -0.1 |
| Majority | Majority | Majority | 5,078 | 17.6 | +11.8 |
| Turnout | Turnout | Turnout | 28,914 | 44.31 | +1.0 |
| | Labour hold | Labour hold | Swing | | |
| Notes ↑ Incumbent member for this constituency |||||||||
Regional Ballot void votes: 145. Want of an Official Mark (0), Voting for more than ONE party or individual candidate (71), Writing or mark by which the Voter could be identified (4), Unmarked or Void for uncertainty (145)

### Elections in the 2010s

Welsh Assembly Election 2016: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Hefin David | 9,584 | 35.3 | −13.7 | 9,416 | 34.7 | -9.3 |
| | Plaid Cymru | Lindsay Whittle | 8,009 | 29.5 | −0.2 | 7,013 | 25.9 | -0.4 |
| | UKIP | Sam Gould | 5,954 | 22.0 | New | 5,555 | 20.5 | +16.7 |
| | Conservative | Jane Pratt | 2,412 | 8.9 | −4.3 | 2,728 | 10.1 | -1.7 |
| | Green | Andrew Creak | 770 | 2.8 | New | 651 | 2.4 | +0.2 |
| | Liberal Democrats | Aladdin Ayesh | 386 | 1.4 | -2.8 | 526 | 1.9 | -1.7 |
| | Abolish | Abolish | Abolish | Abolish | Abolish | 830 | 3.1 | New |
| | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | Monster Raving Loony | 177 | 0.7 | New |
| | TUSC | TUSC | TUSC | TUSC | TUSC | 91 | 0.3 | New |
| | Communist | Communist | Communist | Communist | Communist | 74 | 0.3 | ±0.0 |
| | National Front | National Front | National Front | National Front | National Front | 50 | 0.2 | New |
| Majority | Majority | Majority | 1,575 | 5.8 | −13.5 |
| Turnout | Turnout | Turnout | 27,115 | 43.3 | +1.8 |
| | Labour hold | Labour hold | Swing | | |
Welsh Assembly Election 2011: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Jeffrey Cuthbert | 12,521 | 49.0 | +14.4 | 11,251 | 44.0 | +6.7 |
| | Plaid Cymru | Ronald Davies | 7,597 | 29.7 | +3.9 | 6,717 | 26.3 | +2.2 |
| | Conservative | Owen Meredith | 3,368 | 13.2 | +1.9 | 3,016 | 11.8 | -0.3 |
| | Liberal Democrats | Kay David | 1,062 | 4.2 | −1.9 | 917 | 3.6 | -2.3 |
| | BNP | Anthony King | 1,022 | 4.0 | New | 1,042 | 4.1 | -1.0 |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 983 | 3.8 | -0.8 |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 633 | 2.5 | +1.1 |
| | Green | Green | Green | Green | Green | 551 | 2.2 | -0.6 |
| | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | Welsh Christian | 335 | 1.3 | ±0.0 |
| | Communist | Communist | Communist | Communist | Communist | 77 | 0.3 | -0.1 |
| | English Democrat | English Democrat | English Democrat | English Democrat | English Democrat | 38 | 0.1 | -0.1 |
| Majority | Majority | Majority | 4,924 | 19.3 | +10.5 |
| Turnout | Turnout | Turnout | 25,570 | 41.5 | −0.6 |
| | Labour hold | Labour hold | Swing | +5.2 | |
Regional ballots rejected at the count: 143

### Elections in the 2000s

Welsh Assembly Election 2007: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Jeffrey Cuthbert | 9,026 | 34.6 | −10.8 | 9,707 | 37.3 | -9.8 |
| | Plaid Cymru | Lindsay Whittle | 6,739 | 25.8 | −2.2 | 6,287 | 24.1 | +0.9 |
| | Independent | Ronald Davies | 5,806 | 22.2 | New |
| | Conservative | Richard Foley | 2,954 | 11.3 | +1.2 | 3,149 | 12.1 | +0.7 |
| | Liberal Democrats | Huw Price | 1,596 | 6.1 | +1.1 | 1,601 | 6.1 | -1.4 |
| | BNP | BNP | BNP | BNP | BNP | 1,380 | 5.1 | +3.8 |
| | UKIP | UKIP | UKIP | UKIP | UKIP | 1,201 | 4.6 | +1.2 |
| | Independent - Colin Hobbs | Independent - Colin Hobbs | Independent - Colin Hobbs | Independent - Colin Hobbs | Independent - Colin Hobbs | 1,061 | 4.1 | New |
| | Green | Green | Green | Green | Green | 736 | 2.8 | +0.4 |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 356 | 1.4 | -0.8 |
| | Welsh Christian Party | Welsh Christian Party | Welsh Christian Party | Welsh Christian Party | Welsh Christian Party | 347 | 1.3 | New |
| | Communist | Communist | Communist | Communist | Communist | 95 | 0.4 | New |
| | CPA | CPA | CPA | CPA | CPA | 66 | 0.3 | New |
| | English Democrat | English Democrat | English Democrat | English Democrat | English Democrat | 52 | 0.2 | New |
| Majority | Majority | Majority | 2,287 | 8.8 | −10.8 |
| Turnout | Turnout | Turnout | 26,120 | 42.1 | +5.1 |
| | Labour hold | Labour hold | Swing | −4.3 | |
Welsh Assembly Election 2003: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Jeffrey Cuthbert | 11,893 | 47.1 | +2.9 | 11,956 | 47.1 | +9.5 |
| | Plaid Cymru | Lindsay Whittle | 6,919 | 27.4 | −6.8 | 5,893 | 23.2 | -13.6 |
| | Conservative | Laura Anne Jones | 2,570 | 10.2 | +2.4 | 2,895 | 11.4 | +2.5 |
| | Liberal Democrats | Rob W. Roffe | 1,281 | 5.1 | −7.3 | 1,907 | 7.5 | -4.8 |
| | Independent | Anne Blackman | 1,204 | 4.8 | New |
| | Independent | Avril A. Dafydd-Lewis | 930 | 3.7 | New |
| | UKIP | Brenda M. Vipass | 590 | 2.3 | New | 863 | 3.4 | New |
| | Green | Green | Green | Green | Green | 613 | 2.4 | Unknown |
| | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | Socialist Labour | 549 | 2.2 | Unknown |
| | BNP | BNP | BNP | BNP | BNP | 326 | 1.3 | New |
| | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | Cymru Annibynnol | 280 | 1.1 | New |
| | ProLife Alliance | ProLife Alliance | ProLife Alliance | ProLife Alliance | ProLife Alliance | 96 | 0.4 | New |
| Majority | Majority | Majority | 4,974 | 19.7 | +9.7 |
| Turnout | Turnout | Turnout | 25,387 | 36.8 | −6.4 |
| | Labour hold | Labour hold | Swing | +4.9 | |
2003 Electorate: 68,152 Regional ballots rejected: 316

### Elections in the 1990s

Welsh Assembly Election 1999: Caerphilly :
| Party | Party | Candidate | Constituency | Constituency | Constituency | Regional | Regional | Regional |
| Party | Party | Candidate | Votes | % | ±% | Votes | % | ±% |
| | Labour | Ron Davies | 12,602 | 44.2 | N/A | 10,721 | 37.6 | N/A |
| | Plaid Cymru | Robert Gough | 9,741 | 34.2 | N/A | 10,508 | 36.8 | N/A |
| | Liberal Democrats | Mike German | 3,543 | 12.4 | N/A | 3,496 | 12.3 | N/A |
| | Conservative | Mary Taylor | 2,213 | 7.8 | N/A | 2,542 | 8.9 | N/A |
| | Socialist Alliance | Timothy Richards | 412 | 1.5 |
| | United Socialist | United Socialist | United Socialist | United Socialist | United Socialist | 202 | 0.7 | N/A |
| | Others | Others | Others | Others | Others | 1,050 | 3.7 | N/A |
| Majority | Majority | Majority | 2,861 | 10.0 |
| Turnout | Turnout | Turnout | 28,511 | 43.2 |
| | Labour win (new seat) | Labour win (new seat) | Labour win (new seat) | Labour win (new seat) | Labour win (new seat) |