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The
Parliament of the United Kingdom The Parliament of the United Kingdom is the of the , the and the . It alone possesses and thereby ultimate power over all other political bodies in the UK and the overseas territories. Parliament is but has three parts, consisting of the ...
currently has 650 parliamentary
constituencies An electoral district, also known as an election district, legislative district, voting district, constituency, riding, ward, division, (election) precinct, electoral area, circumscription, or electorate, is a subdivision of a larger state Sta ...
across the constituent countries (
England England is a that is part of the . It shares land borders with to its west and to its north. The lies northwest of England and the to the southwest. England is separated from by the to the east and the to the south. The country cover ...

England
,
Scotland Scotland ( sco, Scotland, gd, Alba ) is a country that is part of the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed. The Guardian' and Tele ...

Scotland
,
Wales Wales ( cy, Cymru ) is a country A country is a distinct territory, territorial body or political entity. It is often referred to as the land of an individual's birth, residence or citizenship. A country may be an independent sovereign ...

Wales
and
Northern Ireland Northern Ireland ( ga, Tuaisceart Éireann ; sco, label= Ulster-Scots, Norlin Airlann) is a part of the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usa ...

Northern Ireland
), each electing a single
member of parliament A member of parliament (MP) is the representative of the people who live in their constituency. In many countries with Bicameralism, bicameral parliaments, this category includes specifically members of the lower house, as upper houses often ha ...
(MP) to the
House of Commons The House of Commons is the name for the elected lower house of the bicameral parliaments of the United Kingdom and Canada. In the UK and Canada, the Commons holds much more legislative power than the nominally upper house of parliament. The lead ...

House of Commons
by the
plurality Plurality may refer to: Voting * Plurality (voting), the most votes for any choice in an election, but not necessarily a majority ** Plurality voting, system in which each voter votes for one candidate and the candidate with a plurality is elected ...
(
first past the post In a first-past-the-post electoral system An electoral system or voting system is a set of rules that determine how elections and Referendum, referendums are conducted and how their results are determined. Political electoral systems are org ...
) voting system, ordinarily every five years.
Voting Voting is a method for a group, such as a meeting or an , in order to make a collective or express an opinion usually following discussions, debates or . elect holders of high office by voting. Residents of a place represented by an elected ...

Voting
last took place in all 650 of those constituencies at the United Kingdom general election on 12 December 2019. The number of seats rose from 646 to 650 at the
2010 general election2010 general election may refer to: * 2010 Anguillan general election * 2010 Australian federal election * 2010 Bougainvillean general election * 2010 Brazilian general election * 2010 Burmese general election * 2010 Cook Islands general election * ...
after proposals made by the boundary commissions for England, Wales and Northern Ireland (the
Fifth Periodic Review of Westminster constituencies The Fifth Periodic Review of Westminster constituencies was undertaken between 2000 and 2007 by the four boundary commissions for England, Scotland Scotland ( sco, Scotland, gd, Alba ) is a Countries of the United Kingdom, country that is ...
) were adopted through
statutory instruments In many countries, a statutory instrument is a form of delegated legislation In parliamentary systems and presidential systems of government, primary legislation and secondary legislation, the latter also called delegated legislation or subordi ...
. Constituencies in Scotland remained unchanged, as the
Boundary Commission for Scotland The boundary commissions in the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed. The Guardian' and Telegraph' use Britain as a synonym for the Unite ...
had completed a review just before the 2005 general election, which had resulted in a reduction of 13 seats.
Primary legislation In parliamentary systems and presidential systems of government, primary legislation and secondary legislation, the latter also called delegated legislation or subordinate legislation, are two forms of law, created respectively by the legislature ...
provides for the independence of the boundary commissions for each of the four parts of the UK; the number of seats for each of the countries; permissible factors to use in departing from any old boundaries; and a strong duty to consult. The Fifth Review was governed by the
Parliamentary Constituencies Act 1986 The Parliamentary Constituencies Act 1986 (c. 56) is an Act of Parliament, Act of the Parliament of the United Kingdom. It is the legislation defining the constitution and work of the four Boundary Commissions (United Kingdom), parliamentary Bounda ...
. Under the
Parliamentary Voting System and Constituencies Act 2011 The Parliamentary Voting System and Constituencies Act 2011 (c. 1) is an Act of Parliament, Act of the Parliament of the United Kingdom that made provision for the holding of a referendum on whether to introduce the Instant-runoff voting, Alternativ ...
, as amended by the Parliamentary Constituencies Act 2020, the number of MPs is now fixed at 650. The Sainte-Laguë formula method is used to form groups of seats split between the four parts of the United Kingdom and the English regions (as defined by the
NUTS 1 statistical regions of England The Nomenclature of Territorial Units for Statistics (NUTS) is a geocode A geocode is a code In communication Communication (from Latin ''communicare'', meaning "to share") is the act of developing Semantics, meaning among Subject (philo ...
).


Overview

The table below gives the number of eligible voters broken down by constituent country, including the average constituency size in each country.


Geographical size of constituencies

The constituencies vary considerably in size. The one with the greatest geographical area is Ross, Skye and Lochaber, at about . The largest in Wales is Brecon and Radnorshire. The smallest constituency by area is
Islington North Islington North () is a United Kingdom constituencies, constituency created in 1885 represented in the House of Commons of the United Kingdom, House of Commons of the Parliament of the United Kingdom, UK Parliament since 1983 by Jeremy Corbyn. He s ...
at .


Parliamentary constituencies in the United Kingdom

The "Region" of the table refers to the NUTS 1 statistical region of England, which coincides with the former
European Parliament constituency Members Member may refer to: * Military jury, referred to as "Members" in military jargon * Element (mathematics), an object that belongs to a mathematical set * In object-oriented programming, a member of a class ** Field (computer science), ...
in which the constituency was included until 31 January 2020. As of the 2019 election there are 533 constituencies in England, 40 in Wales, 59 in Scotland and 18 in Northern Ireland.


England


Scotland


Wales


Northern Ireland


Summary of main boundary changes for the 2010 general election

*
Scotland Scotland ( sco, Scotland, gd, Alba ) is a country that is part of the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed. The Guardian' and Tele ...

Scotland
– No changes from 2005 election. *
Wales Wales ( cy, Cymru ) is a country A country is a distinct territory, territorial body or political entity. It is often referred to as the land of an individual's birth, residence or citizenship. A country may be an independent sovereign ...

Wales
– Number of seats unchanged: three seats were abolished and three were created: Aberconwy, Arfon, and Dwyfor Meirionnydd. *
Northern Ireland Northern Ireland ( ga, Tuaisceart Éireann ; sco, label= Ulster-Scots, Norlin Airlann) is a part of the United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usa ...

Northern Ireland
– No extra or fewer seats allocated. *
England England is a that is part of the . It shares land borders with to its west and to its north. The lies northwest of England and the to the southwest. England is separated from by the to the east and the to the south. The country cover ...

England
: :*The non-metropolitan counties of
Cornwall Cornwall (; kw, Kernow ) is a historic county and ceremonial county The counties and areas for the purposes of the lieutenancies, also referred to as the lieutenancy areas of England and informally known as ceremonial counties, are ar ...

Cornwall
,
Derbyshire Derbyshire (; or ) is a county in the East Midlands of England. It includes much of the Peak District, Peak District National Park, the southern end of the Pennines, Pennine range of hills, and part of the The National Forest (England), Nation ...

Derbyshire
,
Devon Devon (, archaically known as Devonshire) is a county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by William Ch ...

Devon
,
Essex Essex () is a county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by William Chambers (publisher), William and Ro ...

Essex
,
Hampshire Hampshire (, ; abbreviated to Hants) is a Counties of England, county in South East England on the coast of the English Channel. The county town is Winchester, but the county is named after Southampton. Its two largest cities are Southampton a ...

Hampshire
,
Lancashire Lancashire ( , ; abbreviated Lancs.) is a non-metropolitan and ceremonial county The counties and areas for the purposes of the lieutenancies, also referred to as the lieutenancy areas of England and informally known as ceremonial co ...

Lancashire
,
Norfolk Norfolk () is a rural and non-metropolitan county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by William Chambe ...

Norfolk
,
Northamptonshire Northamptonshire (; abbreviated Northants.), archaically known as the County of Northampton, is a historic county in the East Midlands The East Midlands is one of nine official regions of England at the ITL 1 statistical regions of England ...

Northamptonshire
,
Warwickshire Warwickshire (; abbreviated Warks) is a county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by William Chambers ( ...

Warwickshire
and
Wiltshire Wiltshire (; abbreviated Wilts) is a Ceremonial counties of England, county in South West England with an area of . It is landlocked and borders the counties of Dorset, Somerset, Hampshire, Gloucestershire, Oxfordshire and Berkshire. The count ...
each gained one seat. :*Following the abolition of the county of Avon, each of the four successor authorities (
Bristol Bristol () is a city A city is a large human settlement.Goodall, B. (1987) ''The Penguin Dictionary of Human Geography''. London: Penguin.Kuper, A. and Kuper, J., eds (1996) ''The Social Science Encyclopedia''. 2nd edition. London: Routle ...

Bristol
,
South Gloucestershire South Gloucestershire is a unitary authority area in South West England South West England is one of nine official regions of England The regions, formerly known as the government office regions, are the highest tier of sub-national ...
,
Bath and North East Somerset Bath and North East Somerset (commonly referred to as BANES or B&NES) is the district of the unitary authority A unitary authority is a local authority Local government is a generic term for the lowest tiers of public administration Publ ...
, and North Somerset) were considered separately, resulting in significant changes, gaining one seat overall. :*The metropolitan counties of
Greater Manchester Greater Manchester is a metropolitan county The metropolitan counties are a type of county-level administrative division Administrative division, administrative unit,Article 3(1). country subdivision, administrative region, subnational ...

Greater Manchester
,
Merseyside Merseyside ( ) is a metropolitan Metropolitan may refer to: * Metropolitan area, a region consisting of a densely populated urban core and its less-populated surrounding territories * Metropolitan borough, a form of local government district i ...

Merseyside
,
Tyne and Wear Tyne and Wear () is a metropolitan county The metropolitan counties are a type of county-level administrative division Administrative division, administrative unit,Article 3(1). country subdivision, administrative region, subnational ...

Tyne and Wear
,
South Yorkshire South Yorkshire is a ceremonial A ceremony (, ) is a unified ritual A ritual is a sequence of activities involving gestures, words, actions, or objects, performed according to a set sequence. Rituals may be prescribed by the traditio ...

South Yorkshire
,
West MidlandsWest Midlands may refer to: Places * West Midlands (region), a region of the United Kingdom **West Midlands (county), the metropolitan county in the West Midlands region ** West Midlands conurbation, the large conurbation in the West Midlands region ...
and
West Yorkshire West Yorkshire is a metropolitan Metropolitan may refer to: * Metropolitan area, a region consisting of a densely populated urban core and its less-populated surrounding territories * Metropolitan borough, a form of local government district i ...

West Yorkshire
each lost a seat. :*
Inner London Inner London is the name for the group of London boroughs The London boroughs are the 32 local authority districts that make up the ceremonial county The counties and areas for the purposes of the lieutenancies, also referred to as the ...
gained one seat while northern and eastern parts of
Outer London Outer London is the name for the group of London boroughs The London boroughs are the 32 districts of England, local authority districts that make up the Ceremonial counties of England, ceremonial county of Greater London; each is governed by ...
each lost one. :*The City of
York York is a cathedral city City status in the United Kingdom is granted by the monarch of the United Kingdom The monarchy of the United Kingdom, commonly referred to as the British monarchy, is the constitutional monarchy of the United ...

York
was reviewed separately and was divided into two seats, neither overlapping part of
North Yorkshire North Yorkshire is the largest non-metropolitan county A non-metropolitan county, or colloquially, shire county, is a county-level entity in England England is a that is part of the . It shares land borders with to its west and ...

North Yorkshire
. :*
Herefordshire Herefordshire () is a county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by William Chambers (publisher), Willia ...

Herefordshire
and
Worcestershire Worcestershire ( , ; written abbreviation: Worcs) is a county A county is a geographical region of a country used for administrative or other purposesChambers Dictionary The ''Chambers Dictionary'' (''TCD'') was first published by W ...

Worcestershire
, to reflect their full reinstatement as separate counties, were considered in separate reviews, leading to Herefordshire being split into two constituencies, each entirely within the county. :*
Isle of Wight The Isle of Wight () is a Counties of England, county and the List of islands of England, largest and second-most populous island of England. It is in the English Channel, between two and five miles off the coast of Hampshire, from which it is ...
maintained its status as one constituency, the largest by
electorate Electorate may refer to: * The people who are eligible to vote in an Election#Electorate, election, especially their number e.g. the term ''size of (the) electorate'' * The dominion of a Prince-elector in the Holy Roman Empire until 1806 * An electo ...
.


Current boundary reviews

Following the abandonment of the Sixth Periodic Review (the 2018 review), the
Boundary Commission for England The boundary commissions in the United Kingdom are non-departmental public bodies responsible for determining the boundaries of constituency, constituencies for elections to the House of Commons of the United Kingdom, House of Commons. There are fo ...
formally launched the 2023 Review on 5 January 2021. It is due to be completed by July 2023. ''See
2023 Periodic Review of Westminster constituencies The 2023 Periodic Review of Westminster constituencies is the current cycle of the process to redraw the United Kingdom Parliament constituencies, constituency map for the House of Commons of the United Kingdom, House of Commons. The process for ...
for further details.''


See also

* List of former United Kingdom Parliament constituencies *
Member of Parliament A member of parliament (MP) is the representative of the people who live in their constituency An electoral district, also known as an election district, legislative district, voting district, constituency, riding, ward, division, (election) ...
* Lists of electoral districts by nation * United Kingdom general elections overview


References


Bibliography


Boundary Commission for N.I. Fifth Periodical Report (HM Command Paper 73) – Parliamentary Constituencies of Northern Ireland. Retrieved 2013-07-19
{{DEFAULTSORT:List Of United Kingdom Parliament Constituencies Politics of the United Kingdom 2010 United Kingdom general election 2015 United Kingdom general election 2017 United Kingdom general election