Parliamentary Constituency

A geographical area represented by one MP in the House of Commons.

Abbreviation: Constituency

Also used as: parliamentary constituencies, Westminster constituency, Westminster constituencies, UK parliamentary constituency, UK parliamentary constituencies

Source / explainer: Read the UK Parliament explainer on constituencies

Last reviewed: 3 August 2026

A parliamentary constituency is a geographical area represented by one Member of Parliament in the House of Commons. Voters in each constituency choose their MP at a general election or by-election. Constituency boundaries are important because they determine which voters are grouped together for UK parliamentary elections.

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