Seven constituencies cover Clwyd. They are county constituencies (CCs) (for type of returning officer and election expenses) of the House of Commons of the UK Parliament (Westminster), and are used also for elections to the Senedd. The current boundaries have been effective since the 2007 National Assembly for Wales election and the 2010 United Kingdom general election.^[1]

Clwyd is one of the eight preserved counties of Wales. As currently defined, the preserved county consists of the principal areas of Conwy, Denbighshire, Flintshire and Wrexham.

For Senedd elections, constituencies are grouped into additional member electoral regions, and changes to constituency boundaries mean, also, changes to regional boundaries.

Westminster boundaries

From 2010

Constituency	Boundaries
1. Aberconwy CC
2. Alyn and Deeside CC
3. Clwyd South CC
4. Clwyd West CC
5. Delyn CC
6. Vale of Clwyd CC
7. Wrexham CC

  Conservative †   Labour ‡

1997 to 2010

Constituency	Boundaries
1. Alyn and Deeside CC (Westminster)
2. Clwyd South CC (Westminster) (part)
3. Clwyd West CC (Westminster)
4. Conwy CC (Westminster) (part)
5. Delyn CC (Westminster)
6. Meirionnydd Nant Conwy CC (Westminster) (part)
7. Vale of Clwyd CC (Westminster)
8. Wrexham CC (Westminster)

The Clwyd South constituency was also partly a Powys constituency, and the Conwy and Meirionnydd Nant Conwy constituencies were also partly Gwynedd constituencies.

Proposed boundary changes

The Boundary Commission for Wales submitted their final proposals in respect of the Sixth Periodic Review of Westminster Constituencies (the 2018 review) in September 2018. Although the proposals were immediately laid before Parliament they were not brought forward by the Government for approval. Accordingly, they did not come into effect for the 2019 election which took place on 12 December 2019, and which was contested using the constituency boundaries in place since 2010.

Under the terms of the Parliamentary Voting System and Constituencies Act 2011, the Sixth Review was based on reducing the total number of MPs from 650 to 600 and a strict electoral parity requirement that the electorate of all constituencies should be within a range of 5% either side of the electoral quota.

On 24 March 2020, the Minister of State for the Cabinet Office, Chloe Smith, issued a written statement to Parliament setting out the Government's thinking with regard to parliamentary boundaries. They propose to bring forward primary legislation to remove the statutory obligation to implement the 2018 Boundary Review recommendations, as well as set the framework for future boundary reviews in time for the next review which is due to begin in early 2021 and report no later than October 2023. It is proposed that the number of constituencies now remains at the current level of 650, rather than being reduced to 600, while retaining the requirement that the electorate should be no more than +/- 5% from the electoral quota.^[2]

Senedd boundaries

From 2007

Constituency	Senedd region	Constituency boundaries
1. Aberconwy CC (Senedd)	North Wales
2. Alyn and Deeside CC (Senedd)
3. Clwyd South CC (Senedd)
4. Clwyd West CC (Senedd)
5. Delyn CC (Senedd)
6. Vale of Clwyd CC (Senedd)
7. Wrexham CC (Senedd)

The seven constituencies are all in the North Wales electoral region, which also includes two Gwynedd constituencies.

1999 to 2007

Constituency	Assembly region	Constituency boundaries
1. Alyn and Deeside CC (Assembly)	North Wales
2. Clwyd South CC (Assembly) (part)
3. Clwyd West CC (Assembly)
4. Conwy CC (Assembly) (part)
5. Delyn CC (Assembly)
6. Meirionnydd Nant Conwy CC (Assembly) (part)	Mid and West Wales
7. Vale of Clwyd CC (Assembly)	North Wales
8. Wrexham CC (Assembly)

Results

2019

The number of votes cast for each political party who fielded candidates in constituencies comprising Clwyd in the 2019 general election were as follows:

Party	Votes	%	Change from 2017	Seats	Change from 2017
Conservative	118,595	45.5%		6	4
Labour	103,965	39.9%		1	4
Plaid Cymru	15,310	5.9%
Liberal Democrats	13,366	5.1%
Brexit	8,816	3.4%	new
Greens	445	0.2%
Total	260,497	100.0		7

Westminster elections

2005	2010	2015	2017	2019

Assembly/Senedd elections

2007	2011	2016	2021

Historical representation by party

A cell marked → (with a different colour background to the preceding cell) indicates that the previous MP continued to sit under a new party name.

1832 to 1859

  Conservative   Peelite   Whig

1859 to 1885

  Conservative   Liberal

1885 to 1918

  Conservative   Liberal   Liberal Unionist

1918 to 1950

  Coalition Liberal (1918–22) / National Liberal (1922–23)   Conservative   Independent   Labour   Liberal   National Liberal (1931–68)

1950 to 1983

  Conservative   Labour   National Liberal (1931–68)   Social Democratic

1983 to present

  Conservative   Independent   Labour