Five constituencies cover Dyfed, also used for elections to the Senedd. The current boundaries have been effective since the

2007 Welsh Assembly election The 2007 National Assembly for Wales election was held on Thursday 3 May 2007 to elect members to the National Assembly for Wales. It was the third general election. On the same day local elections in England and Scotland, as well as the Scottis ...

and the 2010 United Kingdom general election.

Dyfed Dyfed () is a preserved county in southwestern Wales. It is a mostly rural area with a coastline on the Irish Sea and the Bristol Channel. Between 1974 and 1996, Dyfed was also the name of the area's county council and the name remains in use f ...

is one of the eight

preserved counties of Wales The preserved counties of Wales are the eight current areas used in Wales for the ceremonial purposes of lieutenancy and shrievalty. They are based on the counties created by the Local Government Act 1972 and used for local government and othe ...

, consisting of the

principal areas {{Short description, Formal legal term for a county in England and Wales In England and Wales local government legislation, a principal area is one of the sub-national areas established for control by a principal council. They include most of the ar ...

of Pembrokeshire,

Carmarthenshire Carmarthenshire ( cy, Sir Gaerfyrddin; or informally ') is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as ...

and

Ceredigion Ceredigion ( , , ) is a county in the west of Wales, corresponding to the historic county of Cardiganshire. During the second half of the first millennium Ceredigion was a minor kingdom. It has been administered as a county since 1282. Cer ...

. These principal areas are also known as counties. For Senedd elections, constituencies are grouped into additional member electoral regions.

Westminster boundaries

From 2010

1997 to 2010

Proposed boundary changes

The

Boundary Commission for Wales The boundary commissions in the United Kingdom are non-departmental public bodies responsible for determining the boundaries of constituencies for elections to the House of Commons. There are four boundary commissions: * Boundary Commission for ...

submitted their final proposals in respect of the

Sixth Periodic Review of Westminster Constituencies The 2013 Periodic Review of Westminster constituencies, also known as the sixth Review, or just boundary changes, was an ultimately unfruitful cycle of the process by which constituencies of the House of Commons of the United Kingdom are reviewe ...

(the 2018 review) in September 2018. Although the proposals were immediately laid before

Parliament In modern politics, and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: representing the electorate, making laws, and overseeing the government via hearings and inquiries. Th ...

they were not brought forward by the

Government A government is the system or group of people governing an organized community, generally a state. In the case of its broad associative definition, government normally consists of legislature, executive, and judiciary. Government is ...

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 Parliamentary Voting System and Constituencies Act 2011 (c. 1) is an Act of the Parliament of the United Kingdom that made provision for the holding of a referendum on whether to introduce the Alternative Vote system in all future general ele ...

, 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 Chloe Rebecca Smith (born 17 May 1982) is a British politician who served as Secretary of State for Work and Pensions from September to October 2022. She previously served as Minister of State for Disabled People, Work and Health from 2021 to ...

, 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.

Senedd boundaries

From 2007

The Mid and West Wales region also includes two Powys constituencies and one Gwynedd constituency.

1999 to 2007

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.

Westminster boundaries

From 2010

1997 to 2010

Proposed boundary changes

Senedd boundaries

From 2007

1999 to 2007

Historical representation by party

1832 to 1859

1859 to 1885

1885 to 1918

1918 to 1950

1950 to 1983

1983 to present

See also

Notes and references