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Parliamentary constituencies

The United Kingdom is currently divided into 650 parliamentary constituencies. One Member of Parliament (MP) in the House of Commons represents a single constituency.

Constituency boundaries in the UK are changing. A new set of boundaries for Westminster constituencies will be used at the next UK general election.

Constituency boundaries are reviewed periodically to make sure that constituencies are all roughly a similar size and respect local ties between areas. The reviews alter constituencies to reflect rising and falling populations and changes in the boundaries of the electoral wards that comprise them.

The four Boundary Commissions for England, Scotland, Wales and Northern Ireland have reviewed the UK’s constituency boundaries. They published their final recommendations in June 2023, and the new boundaries they have set out will be used at the next UK general election.

Around 10% of constituencies will have no change to their boundaries. The remainder will change in some way.

In some cases, a ward or several wards will move between constituencies. In others, the changes will be more complicated, ranging from small boundary adjustments to constituencies being ‘abolished’ and split between several successor constituencies.

You can find out which constituency you live in now by typing your home postcode into the search box at:

You can check if, and how, your constituency will change at the next election using a guide produced by the House of Commons Library, with maps showing the changes that are being made to each constituency in the UK:

No. The total number of seats – and so the total number of MPs – will not change. There will still be 650 MPs elected in total.

However, the total number of MPs representing seats in England, Scotland and Wales will change, as follows:

  New number of seats Previously (Difference)
England 543 533 (+10)
Scotland 57 59 (-2)
Wales 32 40 (-8)
Northern Ireland 18 18 (no change)

 

The electorate quota is the average number of voters each constituency should have if all UK voters were to be distributed evenly between them.

The 2023 boundary review is stricter than previous ones in this respect. Constituencies must now have an electorate within 5% of the ‘electoral quota’ – now set at 73,393 registered voters - with just a few exceptions.

Current constituency boundaries have been in use in Scotland since 2005 and in the rest of the UK since 2010. The electoral quota was calculated using data from 2000 in England and between 2002 and 2007 in the rest of the UK.

The numbers of voters in each current constituency varies for a number of reasons. These include population change since the previous review and the different rules used before the 2023 review. Previous rules meant different parts of the UK had different electoral quotas and the Boundary Commissions had greater discretion in creating constituencies with electorates further from the quota if they thought local geography or community ties meant it was desirable.

More research from the House of Commons Library:

Find my constituency

Parliamentary Boundary Commissions

There are four independent boundary commissions that, between them, cover the whole of the UK:

Related information

The United Kingdom is currently divided into 650 parliamentary constituencies, but this has not always been the case. Find out about how the number of seats in the House of Commons has changed.