Which is my constituency?
You can find out which constituency you live in and who your MP was before dissolution, by using our Constituency Finder service. Enter your postcode, a town or county, or the name of your former MP to find links to their biography, voting record and spoken contributions in the Commons.
About your constituency
The Commons Library have produced a range of tools which allow you to look at statistics on UK parliamentary constituencies. You will be able to compare constituencies and examine how they have changed over time.
Constituency breakdown across the UK
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.
Largest and smallest constituencies
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.
Locating your constituency
Services that enable you to map postcodes against constituency areas are available from the Office for National Statistics and the Ordnance Survey.
Constituency boundaries are kept under review by four permanent Boundary Commissions:
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.
Commons Library briefings
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.
Select Committee Inquiry
MPs on the Political and Constitutional Reform Select Committee have carried out an inquiry on the redrawing of parliamentary constituency boundaries.
Find out more about the inquiry: