Five constituencies cover Dyfed, also used for elections to the

Senedd The Senedd ( ; ), officially known as the Welsh Parliament in English and () in Welsh, is the devolved, unicameral legislature of Wales. A democratically elected body, Its role is to scrutinise the Welsh Government and legislate on devolve ...

. The current boundaries have been effective since the 2007 Welsh Assembly election and the

2010 United Kingdom general election The 2010 United Kingdom general election was held on Thursday 6 May 2010, to elect 650 Members of Parliament (or MPs) to the House of Commons of the United Kingdom, House of Commons. The first to be held after the minimum age for candidates was ...

Dyfed Dyfed () is a preserved county in southwestern Wales, covering the modern counties Carmarthenshire, Ceredigion and Pembrokeshire. It is mostly rural area with a coastline on the Irish Sea and the Bristol Channel. Between 1974 and 1996, Dyfed w ...

is one of the eight

preserved counties of Wales Preservation may refer to: Heritage and conservation * Preservation (library and archival science), activities aimed at prolonging the life of a record while making as few changes as possible * Preservation (magazine), ''Preservation'' (magazin ...

, 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 ...

Pembrokeshire Pembrokeshire ( ; ) is a Principal areas of Wales, county in the South West Wales, south-west of Wales. It is bordered by Carmarthenshire to the east, Ceredigion to the northeast, and otherwise by the sea. Haverfordwest is the largest town and ...

Carmarthenshire Carmarthenshire (; or informally ') is a Principal areas of Wales, county in the South West Wales, south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. ...

and

Ceredigion Ceredigion (), historically Cardiganshire (, ), is a Principal areas of Wales, county in the West Wales, west of Wales. It borders Gwynedd across the River Dyfi, Dyfi estuary to the north, Powys to the east, Carmarthenshire and Pembrokeshire t ...

. 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 In the United Kingdom, the boundary commissions are non-departmental public bodies responsible for determining the boundaries of parliamentary constituencies for elections to the House of Commons. There are four boundary commissions: one each f ...

submitted their final proposals in respect of the

Sixth Periodic Review of Westminster Constituencies Sixth is the ordinal form of the number six. * The Sixth Amendment, to the U.S. Constitution * A keg of beer, equal to 5 U.S. gallons or barrel * The fraction Music * Sixth interval (music)s: ** major sixth, a musical interval ** minor ...

(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: Representation (politics), representing the Election#Suffrage, electorate, making laws, and overseeing ...

they were not brought forward by the

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

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 e ...

, 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 The Cabinet Office is a Departments of the Government of the United Kingdom, ministerial department of the Government of the United Kingdom. It is responsible for supporting the Prime Minister of the United Kingdom, prime minister and Cabinet ...

Chloe Smith Chloe Rebecca Smith (born 17 May 1982) is a British Conservative Party (UK), Conservative Party politician who served as the Member of Parliament (United Kingdom), Member of Parliament (MP) for Norwich North from 2009 to 2024. She previously se ...

, issued a written statement to Parliament setting out the Government's thinking with regard to parliamentary boundaries. They propose to bring forward

primary legislation Primary legislation and secondary legislation (the latter also called delegated legislation or subordinate legislation) are two forms of law, created respectively by the legislative and executive branches of governments in representative democ ...

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