List of United Kingdom Parliament constituencies 2005–2010

This is a list of the 646 previous constituencies of the United Kingdom parliament.

There are 650 in the 2010 electionconstituencies currently represented in the House of Commons of the Parliament of the United Kingdom, as at the 2005 general election. Each constituency is represented by a single Member of Parliament (MP).

Constituency boundaries are subject to regular review by the four independent Boundary Commissions, usually once every 10 to 15 years, to keep the electorate of each constituency as close to the national average as is reasonably possible. New constituencies may be created, or existing ones abolished, by these reviews. For the list of recommended constituencies following the current review see Constituencies in the next United Kingdom general election.

Constituencies were long based on boroughs (burghs in Scotland) and counties. Today, constituencies in England are mostly subdivisions of local authorities, with each constituency comprising a number of whole wards. In Scotland, constituencies are subdivisions of council areas, and in Wales they are subdivisions of the preserved counties. Northern Ireland is reviewed as a whole, and constituency boundaries may cross all district borders.

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