This Insight was published before the boundary changes took effect at the 2024 general election. The “new constituencies” it refers to are now in use. More extensive data for these constituencies is now available from our constituency data dashboards.

Ariel View of UK houses

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

While statistics are widely available for the current set of parliamentary constituencies, there is less data about these new constituencies. This Insight provides statistical profiles of the new constituencies from the available data and explains when more data might become available.

How are constituency boundaries changing?

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.

The Library has published an Insight explaining which seats will change in more detail, featuring an interactive map showing individual boundary changes.

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.

Get demographic data about new constituencies

Census data has been released for the new constituency boundaries.

We have compiled some of this data in a file which you can download below:

Download demographic data for new parliamentary constituencies (Excel file, 1.2 MB)

The file has statistics on the following topics:

  • Total population
  • Total number of households
  • Age groups
  • Country of birth
  • Ethnic groups
  • Religion
  • Home ownership and renting (England, Wales and Northern Ireland only).

Scotland’s census took place a year later than in England, Wales and Northern Ireland. The first results were published in May 2024, with further results (including on housing) scheduled for summer 2024.

Where else can I find data about new constituencies?

Census data for England and Wales

The ONS’ data on new constituencies is published as part of its Create a custom dataset tool.

To get data from the tool, select a population type and click ‘continue’, and then change the ‘area type’ to ‘post-2019 Westminster parliamentary constituencies’. You can then add census variables to your dataset and download a data file.

The ONS also has an online Build a custom area profile tool which has census data for new constituencies in England and Wales.

The tool lets you either draw your own geographical area or search pre-defined areas that include the new constituencies. You can then build a statistical profile based on census data.

The images below show how to use the tool. First, type the name of a new constituency into the search box, and select the version with the ‘future constituency’ caption. Then click on the ‘Build profile’ button in the top-right corner.

A screenshot of the ONS' "Build a custom area profile tool". It shows a search box with "Norwich North" typed in, with results for the current and future Norwich North constituency. The constituency boundary is shown on a map, and the header has a button labelled "Build profile".

Image © ONS. Map © Ordnance Survey.

When building a profile, you can select the census variables that you’re interested in and add them to a profile of the constituency. You can then export your profile as an image or a data file.

A second screenshot of the "Build a custom area profile" tool. Norwich North has been selected and a new menu is shown. The user can select topics from a tick-box list. The topics "age profile", "country of birth" and "population" are selected. A profile on the other half of the screen shows charts and statistics for the selected topics.

Image © ONS. Map © Ordnance Survey.

Census data for Northern Ireland

NISRA has published census statistics for the new constituency boundaries as part of its Flexible table builder tool.

To get data, use the ‘Build a custom table’ link, and when choosing a geographical area select ‘Parliamentary constituency 2024’.

Census data for Scotland

Scotland’s census website has a table builder tool that lets you find statistics for different areas. To get data for the new constituencies, select ‘Search data by location’ and then ‘United Kingdom Parliamentary Constituency 2024’.

When will there be more data for new constituencies?

Data from official statistics producers

Eventually, data for new constituencies will be available from the ONS and from government departments that normally provide constituency-level data, such as the Department for Work and Pensions.

In some cases, data for the new constituencies might only be produced after a general election has taken place and the new constituencies are in operation.

Data from the Commons Library

The Commons Library has published more data for new constituency boundaries, based on our own analysis, on the Library website. You can find everything we’ve published so far here.

We also publish a range of statistics for pre-2024 constituencies and other local areas, primarily through our constituency data dashboards.

During this parliament, our focus has been on providing data for active constituencies represented by sitting MPs. Our data dashboards currently provide data for current constituencies, and they will be updated to show new constituencies after the July 2024 general election.

We will publish these updates as soon as is practical. We plan to publish updates on some topics, including demographic data, the day after the general election.

For some other topics, we will only be able to provide data once it has been published by official statistics producers (see above).

For MPs and their offices the Library’s confidential requests service might be able to answer specific questions about new constituencies where small-area data is available, such as for transport, child poverty and broadband.

Cassie Barton: Cassie Barton is a House of Commons Library statistician specialising in demography and housing.

Photo by:  (© By Anthony Brown – stock.adobe.com)

Update

This Insight was amended on 28.11.2023 to explain new 2021 census data published by ONS, on 27.09.2023 to include new constituency data published by NISRA, and on 29.05.2024 to include new constituency data published by NRS. All updates included changes to the data file for download.

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