Cardiff West is a constituency of the Senedd. It elects one Member of the Senedd by the first past the post method of election. Also, however, it is 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. The constituency has twice provided the First Minister of Wales, Rhodri Morgan from 2000-2009 and Mark Drakeford from 2018–2024.

Boundaries

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

Elections

Elections in the 2020s

Elections in the 2010s

Regional ballots rejected at the count: 205

Elections in the 2000s

2003 Electorate: 60,523 Regional ballots rejected: 274

Elections in the 1990s

1999 Electorate: 57,582