The UK is divided into areas called constituencies. One MP is elected to represent each of these areas. The size and number of constituencies are reviewed at intervals of between 8 and 12 years by the Boundary Commissioners. Any changes must be agreed by Parliament.

This dataset contains all UK parliamentary constituencies, both present and historic, where boundary changes have led to the formation/dissolution of new/old constituencies.

Use this dataset

  • If you want a list of constituencies, both current and historic(due to boundary changes)

  • If you want to link data to the Geographical data held by Ordnance Survey

Constituencies Search

This provides a user interface which allows you to search the dataset using multiple filters. Selecting this option will show you the first few records from the dataset and then allow you to select data from the dataset by filtering on any of the attributes for the constituency. You will then be able to download or display the data in the following formats: CSV (e.g. for use in Microsoft Excel), TTL, Text, XML, JSON or RDF (e.g. for developers)

Constituencies API

Developers can build API calls using the explorer tool. Help for the APIs can be found at

Constituencies Atom Feed

The feed contains the 20 most recent resources for Constituencies.This format is mainly for developers. You can refer to for help on the syntax for atom feed requests.