Caerphilly (Senedd constituency)

The constituency was created for the first election to the Assembly, in 1999, with the name and boundaries of the Caerphilly Westminster constituency prior to the 2023 review of Westminster constituencies. The other seven constituencies of the South Wales East electoral region were Blaenau Gwent, Islwyn, Merthyr Tydfil and Rhymney, Monmouth, Newport East, Newport West and Torfaen. ==Voting==

In general elections for the Senedd, each voter had two votes. The first vote was 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 was used to vote for a regional closed party list of candidates. Additional member seats were 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==

Elections in the 2020s A by-election was held on Thursday 23 October 2025, following the death of Hefin David in August 2025. 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 {{AMS election box begin {{AMS election box begin Regional ballots rejected at the count: 143 Elections in the 2000s 2003 Electorate: 68,152 Regional ballots rejected: 316 Elections in the 1990s ==References==