United Kingdom Parliament constituencies
The United Kingdom Parliament currently has 650 Parliamentary constituencies across the constituent countries (England, Scotland, Wales and Northern Ireland), each electing a single Member of Parliament (MP) to the House of Commons by the plurality (first past the post) system of election, ordinarily every five years. Voting last took place in all 650 of those constituencies at the United Kingdom general election on 12 December 2019, and these results have been counted and verified.
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The number of seats rose from 646 at the 2005 general election after proposals made by the boundary commissions for England, Wales and Northern Ireland were adopted through statutory instruments. Constituencies in Scotland remained unchanged, as the Boundary Commission for Scotland had completed a review just before the 2005 general election.
Primary legislation 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. For the 2013 review this was primarily the Parliamentary Voting System and Constituencies Act 2011. 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 EU Parliament Elections).
The electorate figures given in the second column of the tables below are those as of 2017.
Parliamentary constituencies in the United Kingdom
|Largest ceremonial county|
or council area
|Belfast East||63,157||Belfast; Castlereagh|
|Belfast North||68,553||Belfast; Newtownabbey|
|Belfast South||64,927||Belfast; Castlereagh|
|Belfast West||62,697||Belfast; Lisburn|
|East Antrim||62,811||Carrickfergus; Larne; Moyle|
|East Londonderry||66,926||Coleraine; Londonderry/Derry|
|Fermanagh and South Tyrone||70,108||Fermanagh; Dungannon and South Tyrone|
|Lagan Valley||71,152||Lisburn; Banbridge|
|Mid Ulster||67,832||Magherafelt; Cookstown; Dungannon and South Tyrone|
|Newry and Armagh||77,633||Armagh; Newry and Mourne|
|North Antrim||75,876||Ballymena; Ballymoney; Moyle|
|North Down||64,207||Ards; North Down|
|South Antrim||67,425||Antrim; Newtownabbey; Lisburn|
|South Down||75,220||Down; Newry and Mourne; Banbridge|
|Strangford||64,289||Ards; Castlereagh; Down|
|Upper Bann||80,060||Craigavon; Banbridge|
|West Tyrone||63,856||Omagh; Strabane|
Summary of main boundary changes for the 2010 general election
- Scotland – No changes from 2005 election.
- Wales – Number of seats unchanged: three seats were abolished and three were created: Aberconwy, Arfon, and Dwyfor Meirionnydd.
- Northern Ireland – No extra or fewer seats allocated.
- North Yorkshire, Hampshire, Warwickshire, Derbyshire, Norfolk, Essex, Lancashire, Northamptonshire and Cornwall gained seats. Isle of Wight maintained its status as one constituency, the largest by electorate.
- The City of York was divided into two seats, neither overlapping part of North Yorkshire.
- North London, Birmingham and the metropolitan counties of Greater Manchester, Merseyside, Tyne and Wear and South Yorkshire lost a seat each.
- Herefordshire and 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.
- Bath, Bristol and Somerset underwent arguably the most significant changes to reflect the abolition of Avon.
Geographical area of constituencies
The constituency with the greatest geographical area in the UK is Ross, Skye and Lochaber, at about 12,000 square kilometres (4,600 sq mi). The largest in Wales is Brecon and Radnorshire. The smallest constituency by area is Islington North at 7.35 square kilometres (2.84 sq mi).
- "The Parliamentary Constituencies and Assembly Electoral Regions (Wales) Order 2006". www.legislation.gov.uk.
- "The Parliamentary Constituencies (England) Order 2007". www.legislation.gov.uk.
- "The Parliamentary Constituencies (England) (Amendment) Order 2009". www.legislation.gov.uk.
- "The Parliamentary Constituencies (Northern Ireland) Order 2008". www.legislation.gov.uk.
- "A Guide to the 2013 Review" The Boundary Commission for England — retrieved 2012-12-19.
- "Electoral statistics, UK: 2017". ONS. Retrieved 7 August 2018.
- "Electorate Figures – Boundary Commission for England". 2011 Electorate Figures. Boundary Commission for England. 4 March 2011. Archived from the original on 22 October 2012. Retrieved 8 August 2012.
- "Parliamentary Electorate on 1 December 2010" (PDF). 2011 Electorate Figures. Electoral Office of Northern Ireland. 1 December 2010. Archived from the original (PDF) on 21 July 2011. Retrieved 13 March 2011.
- "UK Parliament electors on the Electoral Register by Constituency, Scotland, 2004 to 2010" (PDF). 2011 Electorate Figures. Boundary Commission for Scotland. 24 February 2011. Archived from the original (PDF) on 19 March 2012. Retrieved 13 March 2011.
- "Beyond 20/20 WDS – Table view". 2011 Electorate Figures. StatsWales. 1 December 2010. Retrieved 13 March 2011.
- "Parliamentary constituencies". www.parliament.uk. Retrieved 13 July 2019.
- "Hansard: 2 Jul 2001 : Column 82". www.parliament.uk. Hansard. Retrieved 13 July 2019.