Parliamentary constituencies

UK Parliamentary constituencies

The United Kingdom is currently divided into 650 parliamentary constituencies, each of which is represented by one Member of Parliament (MP) in the House of Commons.

There are currently:

  • 533 constituencies in England
  • 59 in Scotland
  • 40 in Wales, and
  • 18 in Northern Ireland.

The typical size of constituencies differs between parts of the UK. The Office for National Statistics gives the median total parliamentary electorate across constituencies of about 72,400 in England, 69,000 in Scotland, 66,800 in Northern Ireland and 56,800 in Wales.

The largest constituency is Ross, Skye and Lochaber, measuring approximately 12,000 square kilometres.

The smallest constituency is Islington North, measuring 7.35 square kilometres.

Constituency boundaries are kept under review by four permanent Boundary Commissions, one each for England, Scotland, Wales and Northern Ireland.

The Commissions make reports at regular intervals, usually every 5 years, recommending any necessary changes due to population change or changes in local government boundaries.

Any changes must be agreed by both Houses of Parliament.

The House of Commons Library produces briefing papers to inform MPs and their staff of key issues. The papers contain factual information and a range of opinions on each subject, and aim to be politically impartial.

The Library has published papers on the Fifth and Sixth Periodical Reviews of Parliamentary Constituency Boundaries.

MPs on the Political and Constitutional Reform Select Committee are carrying out an inquiry on at how parliamentary constituency boundaries are to be redrawn after the next general election.

Find out more about the inquiry:

You can find out what constituency you are in, and the Member of Parliament who represents that constituency, by using the Find your MP service.

Are you registered to vote?

The general election will take place on Thursday 7 May 2015. To vote in an election you must be on the electoral register. You can register online or by post.

Find Your MP

Boundary Commissions

The Boundary Commissions review UK Parliamentary constituencies.

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External sites

Ordnance Survey has maps of Great Britain which zoom to street level and display electoral boundaries.

Information on mapping postcodes against constituency areas is available from the Office for National Statistics.

(Parliament is not responsible for the content of external sites)