FOI reference: FOI-2025-2984
You asked
As International Territorial Level 3 (ITL3) areas are widely used for statistical reporting and Westminster constituencies are the foundation of the UK political system, I have looked for a spreadsheet of Westminster constituencies for each ITL3. If one exists, please let me know.
Otherwise, please can you publish a list of Westminster constituencies for each ITL3 in the UK. Where a constituency spans more than one ITL3, please indicate that each time the constituency is listed.
We said
Thank you very much for your request.
The boundaries for both the Westminster Parliamentary Constituencies and the International Territorial Level (ITL) regions are available for download via the Open Geography portal:
If you have access to suitable GIS mapping software, these datasets can be overlaid to create the correspondence table you require.
We have also prepared a bespoke correspondence table to support your request. Please find the file in the associated download for your reference.
We publish and maintain a limited set of core geography products, primarily designed to meet the needs of our statistical production teams and the majority of external users. For the most current boundary data and guidance, we recommend consulting the Open Geography portal, which is regularly reviewed and updated.
Should you require further assistance, we encourage you to contact our Geography team directly at ONS.Geography@ONS.gov.uk.
We hope this information proves helpful. Please do not hesitate to reach out if you have any further questions.
Downloads associated with request
- Westminster constituencies for each ITL3 in the UK (45.6 kB xlsx)
- Boundary Dataset Guidance (547.7 kB pdf)