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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 8 June 2017, and these results have been counted and verified.

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.[1][2][3][4] 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).[5]

The electorate figures given in the second column of the tables below are those as of 2017.

Parliamentary constituencies in the United Kingdom


Summary of fundamental boundary changes for the 2010 general election


Updated electorate figures from December 2010 have been added for the English,[7] Northern Irish,[8] Scottish[9] and Welsh[10] constituencies.

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).[11] The largest in England and Wales is Brecon and Radnorshire.[12] The smallest constituency by area is Islington North at 7.35 square kilometres (2.84 sq mi).[11]

See also


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